用于检索“安全哈希算法”修订版的掩码，该修订版更正了SHA中的一个未发布的错误。
A mask used to retrieve a revision of the Secure Hash Algorithm that corrects an unpublished flaw in SHA.
特别对于高级加密标准算法的S盒设计，增加掩码设计可以加强抗线性攻击安全程度。
Especially, the masking design in S-box of advanced encryption standard can make the algorithm safer to against linear attack.
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