Differential cryptanalysis of the data encryption standard
Differential cryptanalysis of the data encryption standard
Linear cryptanalysis method for DES cipher
EUROCRYPT '93 Workshop on the theory and application of cryptographic techniques on Advances in cryptology
Improving Resistance to Differential Cryptanalysis and the Redesign of LOKI
ASIACRYPT '91 Proceedings of the International Conference on the Theory and Applications of Cryptology: Advances in Cryptology
FSE '97 Proceedings of the 4th International Workshop on Fast Software Encryption
On the Interpolation Attacks on Block Ciphers
FSE '00 Proceedings of the 7th International Workshop on Fast Software Encryption
Imprimitive Permutation Groups and Trapdoors in Iterated Block Ciphers
FSE '99 Proceedings of the 6th International Workshop on Fast Software Encryption
A subliminal channel in secret block ciphers
SAC'04 Proceedings of the 11th international conference on Selected Areas in Cryptography
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Rijmen and Preneel recently proposed for the first time a family of trapdoor block ciphers [8]. In this family of ciphers, a trapdoor is hidden in S-boxes and is claimed to be undetectable in [8] for properly chosen parameters. Given the trapdoor, the secret key (used for encryption and decryption) can be recovered easily by applying Matsui's linear cryptanalysis [6]. In this paper, we break this family of trapdoor block ciphers by developing an attack on the S-boxes. We show how to find the trapdoor in the S-boxes and demonstrate that it is impossible to adjust the parameters of the S-boxes such that detecting the trapdoor is difficult meanwhile finding the secret key by trapdoor information is easy.