SET电子支付模型中，采用（ ）公钥算法，生成数字摘要长度是。
- A.RSA
- B.DES
- C.IDEA
- D.SHA
正确答案及解析
正确答案
解析
本题考查密钥算法方面基础知识。密钥算法按加密密钥和解密密钥是否相同，可将现有加密体制分为两种：单钥加密体制和双钥加密体制。使用单钥加密体制加密技术称为对称密钥加密，使用双钥加密体制加密技术称为非对称密钥加密，也称公开密钥加密。常见对称密钥加密算法主要包括：DES算法、IDEA算法、AES算法、RC4算法等。常见非对称密钥加密算法主要包括：RSA算法、E1 Gamal算法、Rabin算法等。报文摘要算法即采用单向Hash算法对需要加密明文进行摘要，而产生具有固定长度单向散列值。其中，散列函数（Hash Functions）是一个将不同长度报文转换成一个数字串（即报文摘要）公式，该函数不需要密钥，公式决定了报文摘要长度。报文摘要算法和非对称密钥加密一起，可以提供数字签名。报文摘要算法主要有安全散列标准和MD系列标准。安全散列算法（Secure Hash Algorithm，简称SHA）它产生160位散列值。SHA已经被美国政府核准作为标准。MD5编码法产生128位密文。在SET电子支付模型中，采用RSA公开密钥加密，利用安全散列算法SHA生成160位数字摘要。
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