对Loiss算法的猜测确定分析

Guess-and-determine attacks on Loiss

分析Loiss算法在抵御猜测确定攻击方面的安全性,并给出一个猜测确定攻击的方法.该攻击方法避免对Loiss算法中BOMM结构的寄存器进行直接猜测从而降低了攻击复杂度.最终攻击的时间复杂度为O(2247),数据复杂度为O(252).

Loiss is a byte-oriented stream cipher.It generates keystream bytes under control of both initial key and IV.We analyze Loiss’ security in resistance to guess-and-determine attack.Without guessing the register cells of BOMM structure in Loiss,we give an attack method with time complexity O（2247） and data complexity O（252）.