关键词: 可信数据库, 数据库外包服务, 可信密钥共享, 无证书, 可信数据共享

Abstract: Trusted database based on database as a service(DAS), in which data owner(DO) stores the cryptographic data in the database service provider, and the key factor is trusted sharing key in trusted sharing data between DO and authorized users. The security of the existing key management approach depends on beforehand securely sha- ring the user key between DO and authorized users in DAS, however, which is an unsolved problem in trusted database yet. This paper proposes a trusted key distribution protocol which provides trusted sharing data between DO and authorized users based on certificateless authentication schema, and gives the analysis of validity and security. The protocol is independent to the security transmission channels and trusted third party, and is proved to be security based on discrete logarithm (DL) problem, inverse Diffie-Hellman (Inv-CDH) problem and q-Strong DH problem.

Key words: trusted database, database as a service (DAS), trusted key sharing, certificateless, trusted data sharing