Recently you learned about substitution ciphers.
最近你了解了有关替换加密的知识。
In cryptography, a cipher produced by a composition of a number of substitution and transposition ciphers.
密码学中，由替代密码和置换密码结合使用而构成的一种密码。
Block ciphers employ substitution boxes (S-boxes) as important components.
S盒是设计分组密码的重要组件。
Block ciphers employ substitution boxes (S-boxes) as important components.
S盒是设计分组密码的重要组件。
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