Abstract: There is a key escrow problem in the traditional identity-based cryptography,when the private key generator has a security problem,it is easytocausethe whole cryptosystem to paralyse,so solving the key escrow problem has always been a hot topic in cryptography research.In view of the problem,a special digital signature scheme based on identity identification was proposed in paper,which did not require the intervention of trusted third party.Firstly,under random oracle model and the assumption of CDH (computational Diffie-Hellman),security of this scheme is proved.Then,the theoretical performance of several identity-based digital signatures is compared and analyzed.Finally,signature scheme is implemented with C language based on PBClibrary,and the actual operation efficiency of several signature schemes is analyzed.Experimental results show that the ave-rage total time of the proposed scheme is about 0.148s,which is approximately 11.9% and 13.5%lower than Subhas and Neetu schemes,which are close to the time of Shamir and Boneh schemes.So,proposed scheme has lower computational complexity and higher efficiency,and is suitable for application scenarios with high data protection requirements,such as transport monitoring of dangerous goods.

Key words: Authorization signature verification, Data cloud, Identity-based cryptography, Key escrow, Special digital signature, Transport monitoring of dangerous goods