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What a lovely hat

Is it made out of tin foil?




Dates are inconsistent

Dates are inconsistent

2 results sorted by ID

2022/668 (PDF) Last updated: 2022-09-13
Key-Reduced Variants of 3kf9 with Beyond-Birthday-Bound Security
Yaobin Shen, Ferdinand Sibleyras
Secret-key cryptography

3kf9 is a three-key CBC-type MAC that enhances the standardized integrity algorithm f9 (3GPP-MAC). It has beyond-birthday-bound security and is expected to be a possible candidate in constrained environments when instantiated with lightweight blockciphers. Two variants 2kf9 and 1kf9 were proposed to reduce key size for efficiency, but recently, Leurent et al. (CRYPTO'18) and Shen et al. (CRYPTO'21) pointed out critical flaws on these two variants and invalidated their security proofs with...

2004/019 (PDF) (PS) Last updated: 2004-02-01
New Security Proofs for the 3GPP Confidentiality and Integrity Algorithms
Tetsu Iwata, Tadayoshi Kohno
Secret-key cryptography

This paper analyses the 3GPP confidentiality and integrity schemes adopted by Universal Mobile Telecommunication System, an emerging standard for third generation wireless communications. The schemes, known as $f8$ and $f9$, are based on the block cipher KASUMI. Although previous works claim security proofs for $f8$ and $f9'$, where $f9'$ is a generalized versions of $f9$, it was recently shown that these proofs are incorrect. Moreover, Iwata and Kurosawa (2003) showed that it is...

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