在密码学中,为了抵抗相关攻击,要求选用的布尔函数具有相关免疫性,高阶的相关免疫函数都是一阶的,一阶的却不一定是高阶的,本文给出了三种判断一阶相关免疫函数是否为二阶或更高阶的新方法.
The Boolean functions in cryptography must be correlated and immune so as to resist correlated attack. Higher order correlation-immune functions is of one-order, while not so as. This paper presents three new methods to judge whether a one-order correlation-immune function is a higher order one.