以下对DES（Data Encryption Standard）描述错误的是（ ）。
- A.DES是一种分组加密算法，每次处理固定长度的数据段
- B.DES算法的加密密钥与解密密钥相同，且采用同样的算法
- C.DES算法的安全性取决于对极大整数做因数分解的难度
- D.DES算法是一种通用的对称密钥算法
正确答案及解析
正确答案
解析
本题考查DES算法的描述。
DES算法是一种对称密钥算法，DES算法的加密和解密密钥相同，都采用了同样的算法。接班原理是每次取明文中连续64位数据，进行分组，通过64位密钥，对明文进行16轮的替代、移位和异或操作，最终得到转换后的64位数据。
综合分析，C选项错误，DES算法的可用性基于对极大整数做因数分解的难度。
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