关键词: 双线性对, 指定验证人代理签密, 自认证密码系统

Abstract: Designated-verifier proxy signcryption requires that only proxy signcrypter on behalf of the original signcrypter can generate the proxy signcryption which is sent to the designated-verifier.Based on the theory of designated-verifier proxy signcryption and self-certified cryptography，a designated-verifier proxy signcryption from pairings is proposed.The scheme has the following features：The signing message is unnecessary to transmit，since the designated-verifier can recover it from the proxy signcryption；the tasks of verifying the authenticity of public key and validating the proxy signcryption are carried out simultaneously in a single step；there is no key escrow problem；there is no explicit authentication to public key by certification.The new scheme only requires two bilinear pairings operations，so its efficiency is higher than the existing ones.

Key words: bilinear pairings, designated-verifier proxy signcryption, self-certified cryptography