数据加密算法提供高质量的数据保护，防止数据未经授权的泄漏和未被觉察的修

改；

具有高的复杂性，使破译的开销超过可能获得的利益，同时要便于理

解和掌握；

安全性应不依赖于密码算法的保密，仅以加密密钥的保密为基础；

实现经济，运行有效，并且适用于多种不同用途-Data encryption algorithm to provide high-quality data protection against data leakage and unauthorized modifications are not aware of　with high complexity, so that the cost of more than deciphering the potential benefits, while easy to understand and master　security should be algorithm does not rely on the confidentiality of the password, only the confidentiality of the encryption key for the foundation　the realization of economic, operating effectively and is applicable to a variety of different uses