关键词: 基于身份密码, 代理签名, 双线性对, 随机预言模型

Abstract: In identity based cryptosystem, the user’s public key is bonded to user’s personal information, so it doesn’t need public key certificate, and improves the management efficiency. In the proxy signature, original signer’s signature right is transferred to proxy signer, thus theirself liberated from “trival” signature affairs. It proposes a new identity based proxy signature scheme and proves its security under the random oracle model. In the scheme, it needs 1 pairing in delegation of proxy right, 2 pairings in verification of proxy signature. Compared with the previous schemes, the efficiency is significantly improved.

Key words: identity-based cryptography, proxy signature, bilinear pairings, random oracle model