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Identity-based verifiably committed signature scheme without random oracles |
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| Authors: | Xun Sun Jian-hua Li Gong-liang Chen |
| Institution: | 1. Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200240, China 2. Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200240, China;School of Information Security Engineering, Shanghai Jiaotong University, Shanghai 200240, China 3. School of Information Security Engineering, Shanghai Jiaotong University, Shanghai 200240, China |
| Abstract: | An identity-based verifiably committed signature scheme (IB-VCS) was proposed, which is proved secure in the standard model (i.e., without random oracles). It enjoys the setup-free property and stand-alone property, both of which make an exchange protocol more practical. The scheme is unconditionally secure against the cheating signer, its security against the cheating verifier is reduced to the computational Diffie-Hellman (CDH) problem in the underlying group, it is secure against the cheating trusted third party if the underlying Paterson Schuldt's identity based signature (IBS) scheme is secure, which is proven true based on the CDH assumption in the standard model. |
| Keywords: | bilinear pairings identity-based verifiably committed signature scheme standard model |
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