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US20060230203A1 - A portable data storage device having a secure mode of operation - Google Patents

A portable data storage device having a secure mode of operation Download PDF

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Publication number
US20060230203A1
US20060230203A1 US11/420,907 US42090706A US2006230203A1 US 20060230203 A1 US20060230203 A1 US 20060230203A1 US 42090706 A US42090706 A US 42090706A US 2006230203 A1 US2006230203 A1 US 2006230203A1
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US
United States
Prior art keywords
storage device
data storage
portable data
memory
unitary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/420,907
Inventor
Chong Cheng
Teng Poo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trek Technology (Singapore) Pte Ltd
Original Assignee
Trek Technology (Singapore) Pte Ltd
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Application filed by Trek Technology (Singapore) Pte Ltd filed Critical Trek Technology (Singapore) Pte Ltd
Priority to US11/420,907 priority Critical patent/US20060230203A1/en
Publication of US20060230203A1 publication Critical patent/US20060230203A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
    • G06F21/31—User authentication
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • G06F21/12—Protecting executable software
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
    • G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
    • G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
    • G06F21/79—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data in semiconductor storage media, e.g. directly-addressable memories
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
    • G06F21/82—Protecting input, output or interconnection devices
    • G06F21/85—Protecting input, output or interconnection devices interconnection devices, e.g. bus-connected or in-line devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
    • G06F3/0604—Improving or facilitating administration, e.g. storage management
    • G06F3/0605—Improving or facilitating administration, e.g. storage management by facilitating the interaction with a user or administrator
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0629—Configuration or reconfiguration of storage systems
    • G06F3/0634—Configuration or reconfiguration of storage systems by changing the state or mode of one or more devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
    • G06F3/0671—In-line storage system
    • G06F3/0673—Single storage device
    • G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C16/00—Erasable programmable read-only memories
    • G11C16/02—Erasable programmable read-only memories electrically programmable
    • G11C16/06—Auxiliary circuits, e.g. for writing into memory
    • G11C16/22—Safety or protection circuits preventing unauthorised or accidental access to memory cells
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/2141—Access rights, e.g. capability lists, access control lists, access tables, access matrices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0662—Virtualisation aspects
    • G06F3/0664—Virtualisation aspects at device level, e.g. emulation of a storage device or system
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C16/00—Erasable programmable read-only memories
    • G11C16/02—Erasable programmable read-only memories electrically programmable
    • G11C16/06—Auxiliary circuits, e.g. for writing into memory
    • G11C16/10—Programming or data input circuits
    • G11C16/102—External programming circuits, e.g. EPROM programmers; In-circuit programming or reprogramming; EPROM emulators

Definitions

  • the invention relates to a portable data storage device, and in particular, a portable data storage device for a computer.
  • the first category is electronic, solid-state memory devices such as read only memory (ROM) and random access memory (RAM). These memory devices are generally fitted within the computer. They are not intended to be removable or portable so that they may be used on different computers, for example, to permit the transfer of data from one computer to another computer.
  • ROM read only memory
  • RAM random access memory
  • the second type of device is surface based data storage devices in which data is stored, typically, on the surface of a disk or tape.
  • Examples of surface storage devices are magnetic disks and CD ROMs.
  • Such data storage devices require a mechanical drive mechanism to be installed in or coupled to the computer to permit the data on the storage device to be read by the computer.
  • such memory devices are limited by the surface area of the storage device, and the combination of the storage device and the drive mechanism for reading data from the storage device is generally bulky and/or delicate due to the moving parts that are required within the drive mechanism and/or storage device.
  • a portable data storage device comprising a coupling device for coupling to a computer serial bus, an interface device coupled to the coupling device, a memory control device and a non-volatile solid-state memory device; the memory control device being coupled between the interface device and the memory device to control the flow of data from the memory device to the coupling device.
  • An advantage of the invention is that by providing a portable data storage device comprising a coupling device with an interface device, memory control device and a non-volatile solid-state memory device, it is possible to provide a portable data storage device which may be coupled to a computer having a serial bus port and which does not include moving parts or require a mechanical drive mechanism to read the data from the data storage device.
  • the non-volatile solid-state memory device may be a read/write memory device, such as a flash memory device.
  • the memory control device controls the flow of data to and from the memory device.
  • the data storage device further comprises a manually operated switch movable between a first position in which writing of data to the memory device is enabled, and a second position in which writing of data to the memory device is prevented.
  • the memory control device may include a read only memory which stores a program to control the operation of the memory control device.
  • the memory control device is a micro-controller.
  • the interface device comprises a universal serial bus (USB) driver to convert data between a USB format and a PC format
  • the coupling device comprises a USB coupling device
  • the interface device comprises a driver for IEEE 1394 (Firewire) protocol
  • the coupling device comprises a Firewire coupling device.
  • FIG. 1 is a schematic block diagram of a portable data storage device
  • FIG. 2 is a flow diagram showing the initial setup of the data storage device by a software supplier
  • FIG. 3 is a flow diagram showing the initial setup of the data storage device by an end user.
  • FIG. 4 is a flow diagram showing operation of the data storage device.
  • FIG. 1 shows a data storage device 10 which includes a USB plug 1 which is coupled to a USB interface device 2 .
  • the USB interface device 2 is coupled to a micro-controller 3 which is coupled to a flash memory 4 .
  • the micro-controller 3 includes a read only memory (ROM) 5 which stores a program to control the operation of the micro-controller 3 .
  • ROM read only memory
  • the operations performed by the micro-controller 3 include comparing passwords entered by a user with a corresponding password stored in the flash memory 4 to determine whether the user is authorized to access the contents of the flash memory 4 .
  • the program stored in the ROM 5 also controls the data flow to and from the flash memory 4 and can also detect whether the computer to which the memory device 1 is coupled has installed software programs which correspond to passwords stored in the flash memory 4 .
  • the micro-controller 3 can automatically retrieve passwords from the installed software to compare with passwords stored in the flash memory to verify that a user of the computer is authorized to access and run the software.
  • the program stored in the ROM 5 also permits the setting of a password in the flash memory by a software supplier to correspond to the password contained in software supplied to a user.
  • the password may correspond to the serial number of the software.
  • the flash memory 4 is typically divided into a number of different sections or zones. Typically, the flash memory is divided into two zones and each zone has a unique password. If the data storage device 10 is supplied with packaged software, the software serial number can be set in one zone to be the password to permit a user to access and use the software. The other zone, which can be used typically for storing a user's data, may have a separate password which is set by the user. Typically, the passwords are stored in a secure location of the flash memory in an encrypted form. The encryption, decrypfion, data flow control and USB protocol are all managed by the micro-controller 3 .
  • the micro-controller 3 also includes a random access memory (RAM) 6 which is a temporary storage area to permit functioning of the micro-controller 3 .
  • RAM random access memory
  • a manual switch 7 is coupled between the flash memory 4 and the micro-controller 3 .
  • the manual switch 7 is movable between a first position in which a user may write data to the flash memory 4 and a second position in which data is prevented from being written to the flash memory 4 .
  • the device 10 also includes a USB socket 8 that is coupled directly to the USB plug 1 and permits other USB devices to be coupled to the USB via the device 10 .
  • a USB plug 1 of a second memory device 10 may be connected to the USB socket 8 .
  • FIG. 2 is a flow diagram showing the set up procedure for the device 10 for a software supplier when the software supplier intends to supply the device as an authentication device for the software.
  • the plug 1 of the device 10 is plugged into 20 to a USB socket on a computer.
  • a communication is established 21 between the computer and the device 10 .
  • the software supplier has pre-installed installation software on the computer which is run by the operator. From the pre-installed software, the operator selects password set up installation 22 , in response to which the pre-installed software requests the operator to enter a password or serial number corresponding to the software with which the device 10 is to be supplied.
  • the password or serial number is then encrypted 26 and stored 27 in the flash memory 4 .
  • FIG. 3 is a flow diagram showing the initial set-up of a password for zone 2 of the flash memory 4 by an end user.
  • the device 10 is typically supplied with driver software that is loaded by the user onto the computer prior to set-up of the device.
  • To set-up the password for zone 2 the user plugs in 20 the device 10 into a USB port on the computer and communication 21 is established between the computer and the device 10 .
  • the user runs the driver software and the driver software enters a password installation set-up mode 23 for zone 2 .
  • the user then enters 28 a password that they wish to use to prevent unauthorized access to zone 2 of the flash memory 4 .
  • the password entered is then encrypted 29 and stored 30 in the flash memory 4 .
  • the computer will establish a communication 21 with the device 10 and firstly, checks 33 an installation status flag stored in the flash memory 4 (see FIG. 4 ). If the status flag is “Y”, the device 10 outputs 34 an “OK” flag to the computer. The micro-controller 3 instructs the computer to issue a request 35 to the user to select the zone they wish to enter. If the status flag is “N”, the device does not output an “OK” flag to the computer, and goes straight to step 35 . In response to the request 35 for zone selection, the user selects 36 either zone 1 or zone 2 .
  • the device 10 assumes that the user wishes to install software on the computer which is stored in the flash memory 4 and requests 37 the appropriate password for confirmation that the user is authorized to install the software.
  • the micro-controller 3 receives the password entered by the user, retrieves the zone 1 password stored in the flash memory 4 , decrypts the zone 1 password and compares it with the password entered by the user to authenticate 38 whether the user is authorized to install the software. If the passwords do not match, the device 10 prompts the computer to request 37 the user to enter the password again.
  • the micro-controller 3 starts 39 the software installation from the flash memory 4 to the computer.
  • the computer sends 40 a read/write command in USB format to the micro-controller 3 for data
  • the micro-controller 3 retrieves the requested data from the flash memory 4 and sends 41 the data to the driver 2 .
  • the driver 2 converts 42 the data to PC format and outputs the data to the computer through the USB plug 1 .
  • the micro-controller 3 then checks 43 whether the software installation is complete. If the operation is not complete, the operation returns to step 40 . If the installation of the software is complete, the status flag stored in the flash memory 4 is changed to “Y” and the device 10 may then be removed 45 from the USB socket on the computer.
  • the micro-controller 3 sends a command to the computer to request 46 the user to enter the password for zone 2 .
  • the computer sends the password to the micro-controller 3 .
  • the micro-controller 3 retrieves the password for zone 2 from the flash memory 4 , decrypts 47 the password and compares it with the password entered by the user. If the password entered by the user is incorrect, the operation returns to step 46 and the computer requests 46 the user for the password again.
  • the user has access to zone 2 of the flash memory 4 to read data from the flash memory 4 and to write data to the flash memory 4 .
  • data can only be written to the flash memory 4 if the manual switch 7 is in the position to permit data to be written to the flash memory 4 .
  • a read or write command is sent 48 by the computer in USB format to the micro-controller 3 .
  • the micro-controller 3 either retrieves 49 data from the flash memory 4 and sends it to the driver 2 for conversion 50 to PC format and then to be output to the computer or receives data from the driver to write it to the flash memory 4 .
  • the micro-controller 3 determines 51 whether the read or write operation is complete. If the operation is not complete it returns to step 48 . If the operation is complete the operation terminates 52 .
  • the device 10 described above is for coupling to a universal serial bus (USB).
  • USB universal serial bus
  • the plug 1 , the interface device 2 and socket 8 could be for use with any appropriate computer serial bus.
  • the device 10 could be modified for use with IEEE 1394 (Firewire) protocol by substituting the USB plug 1 , USB interface device 2 and socket 8 with a Firewire protocol compatible plug, interface device and socket respectively.
  • IEEE 1394 Firewire
  • An advantage of the device 10 described above is that it provides a portable data storage device for a computer which does not require a mechanical operated reading/writing device.
  • the device 10 has no moving parts. This enables to data storage device 10 to be more compact than conventional portable data storage devices.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Software Systems (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Technology Law (AREA)
  • Storage Device Security (AREA)
  • Information Transfer Systems (AREA)
  • Debugging And Monitoring (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)
  • Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Memory System Of A Hierarchy Structure (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)

Abstract

A portable data storage device (10) includes a universal serial bus (USB) coupling device (1) and an interface device (2) is coupled to the USB coupling device (1). The portable data storage device (10) also includes a memory control device (3) and a non-volatile solid-state memory device (4). The memory control device (3) is coupled between the interface device (2) and the memory device (4) to control the flow of data from the memory device (4) to the USB coupling device (1). An authorization input is received from the user of the portable data storage device, a comparison is made comparing the authorization input from the user of the portable data storage device with authorization data stored on the portable data storage device; and access to requested data is granted or denied depending on whether the authorization input from the user corresponds to the stored authorization data.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • This application is a continuation of now pending U.S. patent application Ser. No. 11/415,603 filed May 1, 2006, which is a continuation of U.S. patent application Ser. No. 10/742,644 filed on Dec. 19, 2003, issued as U.S. Pat. No. 7,039,759 on May 2, 2006, which is a continuation of U.S. patent application Ser. No. 09/803,157 filed on Mar. 9, 2001, issued as U.S. Pat. No. 6,880,054 on Apr. 12, 2005, which claims priority to International Patent Application No. PCT/SG00/00029, filed Feb. 21, 2000 incorporated herein by reference in their entirety.
    • FIELD OF THE INVENTION
  • The invention relates to a portable data storage device, and in particular, a portable data storage device for a computer.
    • BACKGROUND
  • Conventional data storage devices generally fall into two categories. The first category is electronic, solid-state memory devices such as read only memory (ROM) and random access memory (RAM). These memory devices are generally fitted within the computer. They are not intended to be removable or portable so that they may be used on different computers, for example, to permit the transfer of data from one computer to another computer.
  • The second type of device is surface based data storage devices in which data is stored, typically, on the surface of a disk or tape. Examples of surface storage devices are magnetic disks and CD ROMs. Such data storage devices require a mechanical drive mechanism to be installed in or coupled to the computer to permit the data on the storage device to be read by the computer. In addition, such memory devices are limited by the surface area of the storage device, and the combination of the storage device and the drive mechanism for reading data from the storage device is generally bulky and/or delicate due to the moving parts that are required within the drive mechanism and/or storage device.
    • SUMMARY OF THE INVENTION
  • In accordance with the present invention, there is provided a portable data storage device comprising a coupling device for coupling to a computer serial bus, an interface device coupled to the coupling device, a memory control device and a non-volatile solid-state memory device; the memory control device being coupled between the interface device and the memory device to control the flow of data from the memory device to the coupling device.
  • An advantage of the invention is that by providing a portable data storage device comprising a coupling device with an interface device, memory control device and a non-volatile solid-state memory device, it is possible to provide a portable data storage device which may be coupled to a computer having a serial bus port and which does not include moving parts or require a mechanical drive mechanism to read the data from the data storage device.
  • Preferably, the non-volatile solid-state memory device may be a read/write memory device, such as a flash memory device.
  • Preferably, where the memory device is a read/write memory device, the memory control device controls the flow of data to and from the memory device.
  • Typically, the data storage device further comprises a manually operated switch movable between a first position in which writing of data to the memory device is enabled, and a second position in which writing of data to the memory device is prevented.
  • Preferably, the memory control device may include a read only memory which stores a program to control the operation of the memory control device. Preferably, the memory control device is a micro-controller.
  • Typically, the interface device comprises a universal serial bus (USB) driver to convert data between a USB format and a PC format, and the coupling device comprises a USB coupling device.
  • Alternatively, the interface device comprises a driver for IEEE 1394 (Firewire) protocol, and the coupling device comprises a Firewire coupling device.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • An example of a data storage device in accordance with the invention will now be described to the accompanying drawings, in which:
  • FIG. 1 is a schematic block diagram of a portable data storage device;
  • FIG. 2 is a flow diagram showing the initial setup of the data storage device by a software supplier;
  • FIG. 3 is a flow diagram showing the initial setup of the data storage device by an end user; and
  • FIG. 4 is a flow diagram showing operation of the data storage device.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • FIG. 1 shows a data storage device 10 which includes a USB plug 1 which is coupled to a USB interface device 2. The USB interface device 2 is coupled to a micro-controller 3 which is coupled to a flash memory 4. The micro-controller 3 includes a read only memory (ROM) 5 which stores a program to control the operation of the micro-controller 3.
  • The operations performed by the micro-controller 3 include comparing passwords entered by a user with a corresponding password stored in the flash memory 4 to determine whether the user is authorized to access the contents of the flash memory 4. The program stored in the ROM 5 also controls the data flow to and from the flash memory 4 and can also detect whether the computer to which the memory device 1 is coupled has installed software programs which correspond to passwords stored in the flash memory 4. The micro-controller 3 can automatically retrieve passwords from the installed software to compare with passwords stored in the flash memory to verify that a user of the computer is authorized to access and run the software. In addition, the program stored in the ROM 5 also permits the setting of a password in the flash memory by a software supplier to correspond to the password contained in software supplied to a user. Typically, the password may correspond to the serial number of the software.
  • The flash memory 4 is typically divided into a number of different sections or zones. Typically, the flash memory is divided into two zones and each zone has a unique password. If the data storage device 10 is supplied with packaged software, the software serial number can be set in one zone to be the password to permit a user to access and use the software. The other zone, which can be used typically for storing a user's data, may have a separate password which is set by the user. Typically, the passwords are stored in a secure location of the flash memory in an encrypted form. The encryption, decrypfion, data flow control and USB protocol are all managed by the micro-controller 3.
  • The micro-controller 3 also includes a random access memory (RAM) 6 which is a temporary storage area to permit functioning of the micro-controller 3. In addition, a manual switch 7 is coupled between the flash memory 4 and the micro-controller 3. The manual switch 7 is movable between a first position in which a user may write data to the flash memory 4 and a second position in which data is prevented from being written to the flash memory 4.
  • The device 10 also includes a USB socket 8 that is coupled directly to the USB plug 1 and permits other USB devices to be coupled to the USB via the device 10. For example, if a user wishes to increase memory space, a USB plug 1 of a second memory device 10 may be connected to the USB socket 8.
  • FIG. 2 is a flow diagram showing the set up procedure for the device 10 for a software supplier when the software supplier intends to supply the device as an authentication device for the software. Firstly, the plug 1 of the device 10 is plugged into 20 to a USB socket on a computer. After the device 10 has been plugged into the USB socket on the computer, a communication is established 21 between the computer and the device 10. The software supplier has pre-installed installation software on the computer which is run by the operator. From the pre-installed software, the operator selects password set up installation 22, in response to which the pre-installed software requests the operator to enter a password or serial number corresponding to the software with which the device 10 is to be supplied. The password or serial number is then encrypted 26 and stored 27 in the flash memory 4.
  • FIG. 3 is a flow diagram showing the initial set-up of a password for zone 2 of the flash memory 4 by an end user. The device 10 is typically supplied with driver software that is loaded by the user onto the computer prior to set-up of the device. To set-up the password for zone 2 the user plugs in 20 the device 10 into a USB port on the computer and communication 21 is established between the computer and the device 10. The user then runs the driver software and the driver software enters a password installation set-up mode 23 for zone 2. The user then enters 28 a password that they wish to use to prevent unauthorized access to zone 2 of the flash memory 4. The password entered is then encrypted 29 and stored 30 in the flash memory 4.
  • After an end user has performed the initial password set up procedure described above and shown in FIG. 3, when a user plugs in 20 the device 10 to a USB port on a computer, the computer will establish a communication 21 with the device 10 and firstly, checks 33 an installation status flag stored in the flash memory 4 (see FIG. 4). If the status flag is “Y”, the device 10 outputs 34 an “OK” flag to the computer. The micro-controller 3 instructs the computer to issue a request 35 to the user to select the zone they wish to enter. If the status flag is “N”, the device does not output an “OK” flag to the computer, and goes straight to step 35. In response to the request 35 for zone selection, the user selects 36 either zone 1 or zone 2.
  • If zone 1 is selected, the device 10 assumes that the user wishes to install software on the computer which is stored in the flash memory 4 and requests 37 the appropriate password for confirmation that the user is authorized to install the software. The micro-controller 3 receives the password entered by the user, retrieves the zone 1 password stored in the flash memory 4, decrypts the zone 1 password and compares it with the password entered by the user to authenticate 38 whether the user is authorized to install the software. If the passwords do not match, the device 10 prompts the computer to request 37 the user to enter the password again.
  • If the password entered by the user matches the password stored in the flash memory 4, the micro-controller 3 starts 39 the software installation from the flash memory 4 to the computer. In order to install software, the computer sends 40 a read/write command in USB format to the micro-controller 3 for data, the micro-controller 3 retrieves the requested data from the flash memory 4 and sends 41 the data to the driver 2. The driver 2 converts 42 the data to PC format and outputs the data to the computer through the USB plug 1. The micro-controller 3 then checks 43 whether the software installation is complete. If the operation is not complete, the operation returns to step 40. If the installation of the software is complete, the status flag stored in the flash memory 4 is changed to “Y” and the device 10 may then be removed 45 from the USB socket on the computer.
  • If a user selects zone 2, the micro-controller 3 sends a command to the computer to request 46 the user to enter the password for zone 2. When the user enters the password, the computer sends the password to the micro-controller 3. The micro-controller 3 retrieves the password for zone 2 from the flash memory 4, decrypts 47 the password and compares it with the password entered by the user. If the password entered by the user is incorrect, the operation returns to step 46 and the computer requests 46 the user for the password again.
  • If the password entered by the user is correct, the user has access to zone 2 of the flash memory 4 to read data from the flash memory 4 and to write data to the flash memory 4. However, data can only be written to the flash memory 4 if the manual switch 7 is in the position to permit data to be written to the flash memory 4. In order to read or write data from or to the flash memory 4 a read or write command is sent 48 by the computer in USB format to the micro-controller 3. In response to the read or write command the micro-controller 3 either retrieves 49 data from the flash memory 4 and sends it to the driver 2 for conversion 50 to PC format and then to be output to the computer or receives data from the driver to write it to the flash memory 4.
  • The micro-controller 3 then determines 51 whether the read or write operation is complete. If the operation is not complete it returns to step 48. If the operation is complete the operation terminates 52.
  • The device 10 described above is for coupling to a universal serial bus (USB). However, the plug 1, the interface device 2 and socket 8 could be for use with any appropriate computer serial bus. For example, the device 10 could be modified for use with IEEE 1394 (Firewire) protocol by substituting the USB plug 1, USB interface device 2 and socket 8 with a Firewire protocol compatible plug, interface device and socket respectively.
  • An advantage of the device 10 described above is that it provides a portable data storage device for a computer which does not require a mechanical operated reading/writing device. In addition, the device 10 has no moving parts. This enables to data storage device 10 to be more compact than conventional portable data storage devices.

Claims (18)

1. A method of restricting access to data on a portable data storage device capable of being coupled to a computer system, the method comprising the steps of:
receiving a portable data storage device that comprises a USB plug capable of being coupled to a USB socket of the computer system, a memory including non-volatile solid-state memory having sufficient capacity to enable the unitary portable data storage device to serve as an alternative to a magnetic disk or CD, and a memory controller coupled to the memory capable of controlling data flow to and from the memory, wherein access to at least a portion of data on the memory is restricted absent confirmation of a user's authorization;
receiving an authorization input from the user of the portable data storage device;
comparing the authorization input from the user of the portable data storage device with authorization data stored on the portable data storage device; and provided that the authorization input from the user corresponds to the stored authorization data, granting the user of the portable data storage device access to requested data.
2. The method of claim 1, further comprising the step of decrypting the stored authentication data.
3. The method of claim 1, further comprising the step of denying the user of the portable data storage device access to the requested data provided that the authorization input does not correspond to the stored authentication data.
4. A unitary portable data storage device comprising:
universal serial bus (USB) plug integrated into the unitary portable data storage device, without an intervening cable, capable of coupling the unitary portable data storage device directly to a USB socket of a computer;
an interface coupled to the USB plug, the interface allowing the unitary portable data storage device to communicate via the USB protocol;
a non-volatile solid-state memory, the memory having sufficient capacity to enable the unitary portable data storage device to serve as an alternative to a magnetic disk or CD; and
a memory controller coupled between the interface and the memory to control the flow of data between the memory and the USB plug in a manner to enable the unitary portable data storage device to serve as an alternative to a magnetic disk or CD and to implement access restriction,
wherein access to at least a portion of the data in the memory is restricted absent confirmation of a user's authorization obtained by comparing an authorization input obtained from the user of the portable data storage device with authorization data stored on the portable data storage device.
5. The unitary portable data storage device as recited in claim 4 wherein the memory controller comprises a micro-controller.
6. The unitary portable data storage device as recited in claim 4 wherein the memory comprises a read/write memory.
7. The unitary portable data storage device as recited in claim 4 wherein the memory comprises flash memory.
8. The unitary portable data storage device as recited in claim 4 wherein the unitary portable data storage device is sufficiently compact to be held within a human hand for maximal portability.
9. An integrated portable data storage device comprising:
universal serial bus (USB) plug integral to the integrated portable data storage device, the integrated portable data storage device capable of being directly connected to a USB socket of a computer via the USB plug such that there is an immediate connection between the integrated portable data storage device and the computer without cable interconnection;
an interface coupled to the USB plug, the interface allowing the integrated portable data storage device to communicate via the USB protocol;
non-volatile solid-state memory, the memory having sufficient capacity to enable the integrated portable data storage device to serve as an alternative to a magnetic disk or CD; and
a memory controller coupled to the memory to control the flow of data between the memory and the USB plug in a manner to enable the integrated portable data storage device to serve as an alternative to a magnetic disk or CD and to implement access restriction wherein access to at least a portion of the data in the memory is restricted absent confirmation of a user's authorization obtained by comparing an authorization input obtained from the user of the portable data storage device with authorization data stored on the portable data storage device; and
wherein the USB plug, the memory and the memory controller are part of an integrated device with a portion of the USB plug protruding the integrated device to facilitate direct coupling to the USB socket.
10. The integrated portable data storage device as recited in claim 9 wherein the memory controller comprises a micro-controller.
11. The integrated portable data storage device as recited in claim 9 wherein the memory comprises a read/write memory.
12. The integrated portable data storage device as recited in claim 9 wherein the memory comprises flash memory.
13. The integrated portable data storage device as recited in claim 9 wherein the integrated portable data storage device is sufficiently compact to be held within a human hand for maximal portability.
14. A unitary portable data storage device comprising:
universal serial bus (USB) plug integrated into the unitary portable data storage device, without an intervening cable, capable of coupling the unitary portable data storage device directly to a USB socket of a computer;
an interface coupled to the USB plug, the interface allowing the unitary portable data storage device to communicate via the USB protocol;
a non-volatile solid-state memory, the memory having sufficient capacity to enable the unitary portable data storage device to serve as an alternative to a magnetic disk or CD; and
a memory controller coupled to the memory and responsive to a stored program to cooperatively control the flow of data between the memory and the computer to enable the unitary portable data storage device to serve as an alternative to a magnetic disk or CD and to implement access restriction,
wherein access to at least a portion of the data in the memory is restricted absent confirmation of a user's authorization obtained by comparing an authorization input obtained from the user of the portable data storage device with stored authorization data.
15. The unitary portable data storage device as recited in claim 14 wherein the memory controller comprises a micro-controller.
16. The unitary portable data storage device as recited in claim 14 wherein the memory comprises a read/write memory.
17. The unitary portable data storage device as recited in claim 14 wherein the memory comprises flash memory.
18. The unitary portable data storage device as recited in claim 14 wherein the unitary portable data storage device is sufficiently compact to be held within a human hand for maximal portability.
US11/420,907 2000-02-21 2006-05-30 A portable data storage device having a secure mode of operation Abandoned US20060230203A1 (en)

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PCT/SG2000/000029 WO2001061692A1 (en) 2000-02-21 2000-02-21 A portable data storage device
US09/803,157 US6880054B2 (en) 2000-02-21 2001-03-09 Portable data storage device having a secure mode of operation
US10/742,644 US7039759B2 (en) 2000-02-21 2003-12-19 Portable data storage device
US11/415,603 US20060200628A1 (en) 2000-02-21 2006-05-01 Portable data storage device
US11/420,907 US20060230203A1 (en) 2000-02-21 2006-05-30 A portable data storage device having a secure mode of operation

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US10/742,644 Continuation US7039759B2 (en) 2000-02-21 2003-12-19 Portable data storage device
US11/415,603 Continuation US20060200628A1 (en) 2000-02-21 2006-05-01 Portable data storage device

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US09/803,173 Abandoned US20020174287A1 (en) 2000-02-21 2001-03-09 Portable data storage device capable of being directly connected via USB plug to a computer
US10/742,644 Expired - Lifetime US7039759B2 (en) 2000-02-21 2003-12-19 Portable data storage device
US11/415,603 Abandoned US20060200628A1 (en) 2000-02-21 2006-05-01 Portable data storage device
US11/420,907 Abandoned US20060230203A1 (en) 2000-02-21 2006-05-30 A portable data storage device having a secure mode of operation
US11/926,505 Expired - Fee Related US8209462B2 (en) 2000-02-21 2007-10-29 Portable data storage device
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US09/803,173 Abandoned US20020174287A1 (en) 2000-02-21 2001-03-09 Portable data storage device capable of being directly connected via USB plug to a computer
US10/742,644 Expired - Lifetime US7039759B2 (en) 2000-02-21 2003-12-19 Portable data storage device
US11/415,603 Abandoned US20060200628A1 (en) 2000-02-21 2006-05-01 Portable data storage device

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