Lecture Notes in Computer Science on Advances in Cryptology-EUROCRYPT'88
A Known Plaintext Attack of FEAL-4 and FEAL-6
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This paper presents a chosen plaintext cryptanalysis of the FEAL-8 cryptosystem. The attack requires the ciphertext corresponding to approximately 10000 pairs of 64 bit plaintext blocks. The difference (bitwise xor) between the two blocks of each pair is equal to an appropriately selected constant. We first state that some differential statistics for intermediate values of the data randomizer are non uniform and independent of the encryption key. We then show that these statistics can be used to compute gradually the expanded key of the data randomizer.In 1989 some announcements were made that the so-called FEAL-8, 8 round version of the FEAL cryptosystem, was vulnerable to a chosen plaintext attack [1], So far, however, only the cryptanalysis of the 4 round version FEAL-4 by Bert Den Boer [2] was published. In this paper we present a chosen plaintext attack of FEAL-8 based on some differential statistics of its data randomization scheme.