即美国国家数据加密标准(the United States Data Encryption Standard)，是一个块密码算法，块长8字节，密钥长56位。
DES, the United States Data Encryption Standard, is a block cipher algorithm with 8-byte long blocks and a key length of 56 bits.
本文结合基于位长四叉树和上下文模型的嵌入零块编码算法提出了一种带描述的流打包方法。
A new stream packet method with stream description is brought forward in this dissertation by linking with the Bit Length Quad-tree Not List Embedded Zero Block Coding and Context Modeling algorithm.
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