求翻译：数字密码算法是信息安全领域信心的一项重要技术，它能有效地保护信息安全。本文对密码学提出了一个简单的介绍，说明了其构成和安全性，并且实现了一个基本的混合密码系统。它使用DES作为对称密钥算法，RSA作为公开密钥算法，既能用于数据加密也能用于数字签名，容易理解和操作，并且该算法是一种非对称密码算法，需要一对密钥，其中一个加密，另一个解密，以保证在其存储，处理，传送以及交换过程中不会泄露，是对其实施保护，保证信息安全的有效措施。是什么意思？

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