以发送方向接收方传递一段交易信息为例，数字信封技术是指（ ）。
- A.用接收方公钥加密交易信息后发送到接收方
- B.用接收方私钥加密交易信息后发送到接收方
- C.用对称密钥对交易信息进行加密，形成密文，用接收方公钥加密对称密钥，然后一起发送到接收方
- D.用对称密钥对交易信息进行加密，形成密文，用接收方公钥加密密文，然后发送到接收方
正确答案及解析
正确答案
解析
数字信封是一种综合利用对称加密技术和非对称加密技术两者优点进行信息安全传输一种技术。信息发送者首先利用随机产生对称密码加密信息，再利用接收方公钥加密对称密码，被公钏加密后对称密码被称为数字信封。在传递信息时，信息接收方若要解密信息，必须先用自己私钥解密数字信封，得到对称密码，才能利用对称密码解密所得到信息。这样就保证了数据传输真实性和完整性。数字信封技术既发挥了对称加密算法速度快、安全性好优点，又发挥了非对称加密算法密钥管理方便优点。
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