KR20000054258A - Method of securing shot message and the system - Google Patents

Abstract

PURPOSE: A method and a system for encoding short messages are provided, so that customers can safely receive short message services(SMSs), by encoding the short messages when the short messages are transmitted to mobile communications terminals from a message center. CONSTITUTION: A method for encoding short messages to transmit the short messages to mobile communications terminals from a message center, comprises the steps of: generating a first random number encoded in the message center; generating an encoding key for encoding declarative sentences by using the encoded random number; and encoding the declarative sentences by using the encoding key.

Description

Short message encryption method and system

The present invention relates to a short message service of a mobile communication terminal, and more particularly, to a method for encrypting an SMS message.

The short message service technology of the conventional mobile communication terminal provides only a short message service (hereinafter referred to as SMS). When a subscriber registers with an SMS and tries to send an SMS text to a subscriber, the plain text message service It is delivered to a mobile communication terminal through a communication interface such as CDMA / TDMA.

As shown in Figure 1, the plain text M is sent to the message center 150 as it is, the message itself is not encrypted. However, as technology advances, any SMS that always floats in the air can be captured, so the security is greatly reduced, so there is a high possibility of hacking.

The present invention provides an SMS message encryption method and method for encrypting a short message when transmitting a short message to a mobile communication terminal in a message center.

Figure 1 illustrates the protocol steps of a conventional short message service.

2 illustrates a configuration of a short message service system according to the present invention.

3 shows an embodiment of the protocol stage of the short message service according to the present invention.

In a method for encrypting a short message service according to the present invention for solving the technical problem, a method of encrypting a short message to transmit a short message from a message center to a mobile communication terminal, the method comprising the steps of: (a) Generating a random number; (b) generating an encryption key for encrypting plain text using the encrypted random number; And (c) encrypting the plain text using the encryption key.

The encrypted plain text may be transmitted from the message center to the mobile communication terminal.

The mobile communication terminal may generate an encryption key using the first random number and then decrypt the encrypted sentence.

Short message encryption service system according to the present invention for solving the technical problem in the short message service system for transmitting a short message from the message center to the mobile communication terminal, the message center generates a random number r1, generated Generates an encryption key Ks necessary for encrypting the plain text M using r1, and transmits the generated encrypted message to a mobile communication terminal, and the mobile communication terminal generates Ks using the encrypted random number r1 and encrypts it. It is characterized in that the decoded sentence.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a short message service system according to the present invention, a mobile communication terminal 210, a base station 220, a base station controller 230, a mobile communication switching center 240, a message center 250, a network 260 and a personal computer 270.

The mobile communication terminal 210 is a communication terminal such as a cellular phone, a PCS, a PDA, and the like, and decrypts an encrypted sentence using a random number encrypted from the message center 250.

Base station 220 is a device that takes care of the cell in the wireless network.

The base station controller 230 is a device for adjusting a base station.

The mobile communication switching center 240 is a device that is responsible for switching between each mobile communication terminal 310.

Message center 250 is a device that manages when sending and receiving a short message, generating a random number r1, using the generated r1 to generate the encryption key Ks required to encrypt the plain text M, the generated encrypted message To transmit to the mobile communication terminal (210).

Personal computer 270 is a device that sends messages directly to a user.

Based on the above configuration, the short service encryption method according to the present invention will be described in detail.

3 illustrates a protocol for a short service encryption method according to the present invention.

In the message center 250, r1, which is a secure random number, is generated, and an encryption key Ks necessary for encrypting the plain text M is generated using the generated r1.

M` = r1 || E (M, Ks)

Here, M`: encrypted plaintext, ||: concatenation of two sentences, r1: secure random number, M: plaintext, and Ks: cryptographic key.

Therefore, the encrypted message generated as in Equation 1 is transmitted from the message center 350 to the mobile communication terminal 210.

The mobile communication terminal 210 generates the Ks by using the encrypted random number r1 and then decrypts the encrypted sentence.

M = D (M, Ks)

Here, D (M, Ks): means that the ciphertext M is decrypted by the key Ks.

The drawings and specification are merely exemplary of the invention, which are used for the purpose of illustrating the invention only and are not intended to limit the scope of the invention as defined in the appended claims or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the present invention, the short message is encrypted so that the SMS can be more securely provided.

Claims (5)

A method for encrypting a short message to send a short message from a message center to a mobile terminal, the method comprising: (a) generating an encrypted first random number at the message center; (b) generating an encryption key for encrypting plain text using the encrypted random number; And and (c) encrypting the plain text using the encryption key. The method of claim 1, wherein the encrypted plain text is Short message encryption method characterized in that the transmission from the message center to the mobile communication terminal. The method of claim 2, wherein the encrypted plain text is M` = r1 || E (M, Ks) (Where M`: encrypted plaintext, ||: concatenation of two sentences, r1: secure random number, M: plaintext, and Ks: cryptographic key.) Short message encryption method characterized in that represented by. The method of claim 2, wherein the mobile communication terminal And generating an encryption key using the first random number and then decrypting an encrypted sentence. A short message service system for transmitting a short message from a message center to a mobile communication terminal, The message center Generating a random number r1, generating an encryption key Ks necessary for encrypting the plain text M using the generated r1, and transmitting the generated encrypted message to the mobile communication terminal, The mobile communication terminal Short message encryption service system, characterized in that for generating the Ks using the encrypted random number r1 and then decrypt the encrypted sentence.