由于【块加密算法】对明文的长度有要求，所以用这类算法对明文数据进行加密之前，要先进行【补齐】——在明文数据末尾追加一些垃圾数据，使之达到【块长度】的整数倍。 ◇流加密算法 与“块加密算法”相对应的是“流加密算法”，洋文叫做“Stream Cipher”，相关的维基百科页面在“ 这里 ”。 与“块加密算法”最大的差别在于——流加密算法对明文数据的长度【没有】要求（可以是任意字节数）。 典型的流加密算法是 RC4 （顺便提一句：RC4 里面的 R 也就是 RSA 的那个 R） ◇MAC（消息认证码） MAC 是洋文“Message Authentication Code”的缩写，维基百科的介绍在“ 这里 ”。

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