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SEAL was first introduced in [1] by Rogaway and Coppersmith as a fast software-oriented encryption algorithm. It is a pseudorandom function which stretches a short index into a much longer pseudorandom string under control of a secret key pre-processed into internal tables. In this paper we first describe an attack of a simplified version of SEAL, which provides large parts of the secret tables from approximately 224 algorithm computations. As far as the original algorithm is concerned, we construct a test capable of distinguishing SEAL from a random function using approximately 230 computations. Moreover, we describe how to derive some bits of information about the secret tables. These results were confirmed by computer experiments.

χ2 cryptanalysis of the SEAL encryption algorithm