 In each round, each byte has added to it the S-box value of the sum of a key byte and the previous data byte, then it is rotated left one bit.The design attempts to compensate for the simplicity of this round transformation by using 32 rounds.Due to the simplicity of its key schedule, using the same eight key bytes in each round, Treyfer was one of the first ciphers shown to be susceptible to a slide attack.