在DES算法中,加密和解密使用( )的密钥。
- A.相同
- B.不同
- C.公开
- D.私人
正确答案及解析
正确答案
解析
本题考查信息加密技术DES算法。
加密技术分为对称密钥体制和非对称密码体制。DES算法是属于对称密码体制,基本原理是加密和解密密钥相同,即是使用的相同的密钥。故本题选A。
对称密钥体制
基本原理:加密密钥和解密密钥相同
常见算法:DES、3DES、IDEA、RC5、AES算法等
非对称密码体制
基本原理:加密和解密采用不同的密钥
常见算法:RSA、ECC、DSA算法等
对称密码体制和非对称密码体制存在的一些问题。
对称密码体制
优点:算法简单、加密和解密速度快,效率高
问题:密钥传递安全问题、密钥管理问题、身份识别问题
非对称密码体制
克服了对称密钥密码体制的缺点,解决了密钥的分发和管理问题。另外,非对称密钥密码体制能够实现数字签名技术,解决了参与者身份识别问题,但由于算法复杂,算法的运行速度不高,加密信息的效率降低。
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