How to construct pseudorandom permutations from pseudorandom functions
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Elastic block ciphers: the basic design
ASIACCS '07 Proceedings of the 2nd ACM symposium on Information, computer and communications security
Elastic block ciphers
The Security of Elastic Block Ciphers Against Key-Recovery Attacks
ISC '07 Proceedings of the 10th international conference on Information Security
Efficient constructions of variable-input-length block ciphers
SAC'04 Proceedings of the 11th international conference on Selected Areas in Cryptography
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ProvSec'11 Proceedings of the 5th international conference on Provable security
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"VIL Block Cipher" is a kind of block cipher that supports Variable Input-Lengths. It was first proposed by Bellare, etc. and since then several constructions have been given, among which Cook's elastic block cipher is a special one. In this paper we present a security model called "MIL model" for VIL block ciphers, investigating their security when a fixed secret key is used for multiple input-lengths. Our results show that if the key schedule is not well designed, Cook's elastic block cipher is vulnerable when processing multiple-length inputs under a fixed secret key. Thus, further considerations are needed to use Cook's elastic block cipher safely in practice.