摘要
In an identity based proxy signature (IBPS) scheme, a designated proxy signer can generate the signature on behalf of an original signer. Traditional IBPS schemes normally rely on the assumption that private keys are kept perfectly secure. However, due to viruses, worms or other break-ins allowed by operating-system holes, key exposure seems inevitable. To minimize the damage caused by key exposure in IBPS, we propose an identity-based key-insulated proxy signature (IBKIPS) scheme in the standard model, i.e. without random oracles.
In an identity based proxy signature （IBPS） scheme, a designated proxy signer can generate the signature on behalf of an original signer. Traditional IBPS schemes normally rely on the assumption that private keys are kept perfectly secure. However, due to viruses, worms or other break-ins allowed by operating-system holes, key exposure seems inevitable. To minimize the damage caused by key exposure in IBPS, we propose an identity-based key-insulated proxy signature （IBKIPS） scheme in the standard model, i.e. without random oracles.
基金
the National Natural Science Foundation of China (Nos. 60970111, 60903189 and 60903020)
the National High Technology Research and Development Program (863) of China (No. 2009AA01Z418)
the National Basic Research Program (973) of China (No. 2007CB311201)
