在数字信封技术中，发放方用（ ）对对称密钥加密。
- A.接收方的公钥
- B.发送方的私钥
- C.发送方的公钥
- D.接收方的私钥
正确答案及解析
正确答案
解析
本题考查数字信封技术的基本知识。
数字信封是实现信息完整性验证的技术，通常通过使用接收方的公钥对对称密钥来进行加密，以保证对称密钥的安全性。有示意图如下：
故本题选A。
数字信封结合了对称加密技术和非对称加密技术，在数字信封的应用中，往往扬长避短，将两者结合起来，对原文信息采用对称密钥进行加密，再利用非对称密钥加密传递对称密钥，这样既保住了信息传递的安全性，也考虑到了信息加密的时间效率。
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