3.txt

这是一个简单的加密程序

Q is a symmetric block cipher. It is defined for a block size of 128 bits. It allows arbitrary length passwords. The design is fairly conservative. It consists of a simple substitution-permutation network. In this paper we present the cipher, its design criteria and our analysis. The design is based on both Rjindael and Serpent. It uses an 8-bit s-box from Rjindael with the linear mixing layers replaced with two Serpent style bit-slice s-boxes and a linear permutation. The combination of methods eliminates the high level structure inherent in Rjindael while having better speed and avalanche characteristics than Serpent.  Speed is improved over Serpent. This version 2.00 contains better analysis, editorial changes, and an improved key scheduling algorithm. The number of recommended rounds is also increased.  zhao xiao chuan