| Computer Science and Technology |
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| Certificateless key-insulated signature without random oracles |
| Zhong-mei WAN, Xue-jia LAI, Jian WENG, Sheng-li LIU, Yu LONG, Xuan HONG |
| Department of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; College of Science, Hohai University, Nanjing 210098, China; Department of Computer Science, Jinan University, Guangzhou 510630, China; School of Information Systems, Singapore Management University, Singapore 178902, Singapore |
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Abstract Leakage of the private key has become a serious problem of menacing the cryptosystem security. To reduce the underlying danger induced by private key leakage, Dodis et al.(2003) proposed the first key-insulated signature scheme. To handle issues concerning the private key leakage in certificateless signature schemes, we devise the first certificateless key-insulated signature scheme. Our scheme applies the key-insulated mechanism to certificateless cryptography, one with neither certificate nor key escrow. We incorporate Waters (2005)’s signature scheme, Paterson and Schuldt (2006)’s identity-based signature scheme, and Liu et al.(2007)’s certificateless signature scheme to obtain a certificateless key-insulated signature scheme. Our scheme has two desirable properties. First, its security can be proved under the non-pairing-based generalized bilinear Diffie-Hellman (NGBDH) conjecture, without utilizing the random oracle model; second, it solves the key escrow problem in identity-based key-insulated signatures.
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Received: 15 October 2008
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