A CERTIFICATELESS SIGNATURE SCHEME WITHOUT RANDOM ORACLES

Tóm tắt

In the context of certificateless public key cryptography, there is no need to use the certificate to certify the public key, and neither the user nor the authority can derive the full private key by himself. There have been several efforts to propose a certificateless signature (CLS) scheme in the standard model, but all of them either make use of the Waters' technique or of the generic conversion technique which both lead to inefficient schemes. In this paper, we introduce a new and direct approach to construct a CLS scheme, secured in the standard model, with constant-size of all parameters and having efficient computing time. Our scheme is therefore very efficient when comparing to existing CLS schemes in the standard model.