We introduce a practical stream cipher with provable security named QUAD. The cipher relies on the iteration of a multivariate quadratic system of m equations in n < m unknowns over a finite field. The security of the keystream generation of QUAD is provably reducible to the conjectured intractability of the MQ problem, namely solving a multivariate system of quadratic equations. Our recommended version of QUAD uses a 80-bit key, 80-bit IV and an internal state of n = 160 bits. It outputs 160 keystream bits (m = 320) at each iteration until 40 bits of keystream have been produced. © International Association for Cryptologic Research 2006.
CITATION STYLE
Berbain, C., Gilbert, H., & Patarin, J. (2006). QUAD: A practical stream cipher with provable security. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 4004 LNCS, pp. 109–128). Springer Verlag. https://doi.org/10.1007/11761679_8
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