DES, the United States Data Encryption Standard, is a block cipher algorithm with 8-byte long blocks and a key length of 56 bits.

即美国国家数据加密标准(the United States DataEncryption Standard)，是一个块密码算法，块长8字节，密钥长56位。

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In this context a message is an entire block of data, of arbitrary length.

在这方面，一消息是整个数据块的任意长度。

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In this context a message is an entire block of data, of arbitrary length.

在这方面，一消息是整个数据块的任意长度。

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