The main principle is that before data communication, encrypts the message plaintext by using DES mode and encrypts DES key by using RSA mode and realizes the digital signature.

其主要原理是在数据通信前，用DES方法对消息明文进行加密，同时用RSA方法对DES密钥进行加密和实现数字签名。

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The key and the plain text are processed together according to the DES algorithm to produce the encrypted (cipher text) form of the plain text data.

根据des算法对密钥和纯文本统一处理以生成一个加密的(密文)形式的纯文本数据。

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The accompanying source code USES XML encryption that only recognizes the triple-DES algorithm, hence I create the key with that algorithm.

本文附带的源代码使用的xml加密方法只能识别三重des (Triple - DES)加密算法，因此我就用这种算法创建密钥。

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DES, developed by IBM Corp. and adopted by NIST in 1977, has only one key size -- 56 bits, which is the length of the encryption algorithm.

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