Cryptanalysis of DES with a reduced number of rounds
Lecture notes in computer sciences; 218 on Advances in cryptology---CRYPTO 85
Linear cryptanalysis method for DES cipher
EUROCRYPT '93 Workshop on the theory and application of cryptographic techniques on Advances in cryptology
Differential cryptanalysis of feal and N-hash
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
New approaches to the design of self-synchronizing stream ciphers
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
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Three attacks on the DES with a reduced number of rounds in the Cipher Feedback Mode (CFB) are studied, namely a meet in the middle attack, a differential attack, and a linear attack. These attacks are based on the same principles as the corresponding attacks on the ECB mode, They are compared to the three basic attacks on the CFB mode. In 8-bit CFB and with 8 rounds in stead of 16, a differential attack with 239.4 chosen ciphertexts can find 3 key bits, and a linear attack with 231 known plaintexts can find 7 key bits. This suggests that it is not safe to reduce the number of rounds in order to improve the performance. Moreover, it is shown that the final permutation has some cryptographic significance in the CFB mode.