关键词: 公钥密码 对称密码 单向hash函数 数字签名 身份认证

Abstract:

In actual life, we know some database information need to be protected, such as the number databases of a special organization. The member databases of a special organization has very important commercial values, and it is usually controlled by the special organization. It is a very important job to p revent the member databases from being stolen by other organizations. Cryptography can complete the job to protect the member databases. In this paper,  we propose two kinds of database protection schemes based on cryptography.

Key words: public key cipher, symmetric cipher, unilateral hash function, digital signature, identity authentication