Parameters Recommended
The authors recommend to use a version of QUAD with 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 240 bits of keystream have been produced.
At Eurocrypt 2006, speed reports were presented for QUAD instances with 160-bit state and output block over the fields GF(2), GF(16), and GF(256). These speed reports were part of an analysis of "Efficient Implementations of Multivariate Quadratic Systems" which was published by Berbain, Billet, and Gilbert at SAC 2006. This analysis (which also covers several multivariate public-key schemes as well as the QUAD stream cipher) studied in part the impact of changing the size of the field on the performances without considering the security aspect.
Read more about this topic: QUAD (cipher)
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