基于数字签名的加密数据库授权共享技术

加密数据库的密钥管理是实现加密数据库安全共享的核心问题之一。本文利用现代密码学中的数字签名技术，提出了一种新的加密数据库授权访问控制和密钥管理方法，构建了安全的加密数据库授权共享机制。公钥密码的高度安全性充分保证了用户身份的不可伪装性和数据库密钥的高度秘密性，实现了数据库的共享性与秘密性的有机结合与统一。

The Technology of Authorized Sharing of Encrypted Database Based on Digital Signature

The management of key of encrypted database is one of the kernel problems. Based on modern cryptographic technology: digital signature, this thesis proposes a new method for the authorized access (control) and key management of encrypted database. A secure mechanism of the authorized sharing of encrypted database is constructed. The properties of sharing and secrecy of database are combined reasonably since the non-personating of user identity and the high secrecy of database key can be assured by the high security of public key cryptosystem.