Identity Based Proxy Re-Signature Schemes without Random Oracle
Xiaoming Hu, Zhe Zhang, Yinchun Yang · 2009
Based on Gentry' s identity based encryption, an identity based proxy re-signature scheme is proposed that is existentially unforgeable in the standard model under the q-SDH (Strong Diffie-Hellman) assumption. Comparison with all previous proxy re-signature schemes, the proposed scheme has a tight security reduction and very compact public parameters. It is also very efficient and practical.