Research And Application Of Blind Signature Technolog

In the information age,people’s lives have become inseparable from the internet.A large number of data are transmitted on the network,which contains the user’s identity and other sensitive information.While users experience the convenience brought by the network,there is also the risk of privacy disclosure.How to protect the privacy of data transmission on the network has become a top priority.Digital signature technology can effectively ensure the authenticity,integrity and non-repudiability of the transmitted data.In some special occasions,users want to obtain valid signatures with ensuring their anonymity.Then,blind signature technology comes into being.Because of the effective protection of user privacy and wide application prospect,blind signature has been widely concerned and studied by many scholars since it was proposed.In order to address the shortcomings of existing blind signature schemes in terms of efficiency and applicability,the blind signature technique continues to be studied in depth.At first,in order to improve the efficiency of existing partially blind signature schemes,an efficient certificateless partially blind signature(ECLPB)scheme is proposed.Secondly,because the existing message recoverable blind signature schemes existing the key escrow problem,a pairing-based certificateless blind signature with message recovery(PCLBSMR)scheme is proposed,and then a pairing-free certificateless blind signature message recovery(FCLBSMR)scheme is proposed.Both schemes have no key escrow problem and achieve higher security.Finally,the ECLPB scheme and the FCLBSMR scheme are applied to the electronic voting system to design an electronic voting system based on blind signature.The main works are as follows:(1)An efficient certificateless-based partially blind signature scheme is proposed.In order to reduce the storage and management cost of certificates and improve the efficiency of the partially blind signature,the certificateless signature mechanism is introduced into identitybased partially blind signature.And an efficient certificateless partially blind signature scheme is proposed.The certificateless cryptosystem has no key escrow problem and the scheme does not use bilinear mapping operation.Therefore,the scheme has obvious advantages in security and computing performance.And the scheme satisfies correctness,resistance to public information tampering attacks,partially blindness and unforgeability.The efficiency analysis shows that the scheme is more efficient than most partially blind signature schemes.(2)The certificateless blind signature with mesaage recovery schemes are propsed.The current mainstream message recoverable blind signature schemes are based on identity cryptosystem and have inherent key escrow problem.To solve the problem caused by identity cryptosystem,this paper combines certificateless cryptosystem with message recoverable blind signature,and bases on bilinear pairing operation.Then,the paper proposes a pairing-based certificateless blind signature with message recovery scheme.The scheme based on certificateless cryptosystem has no key escrow problem and obtains better security.In order to improve the efficiency of the certificateless blind signature with message recovery scheme,this paper combines certificateless cryptosystem with message recoverable blind signature,and avoids the bilinear pairing operation.Then,the paper proposes a pairing-free certificateless blind signature with message recovery scheme.And the scheme can be applied in scenarios with constrained computational resources.The message recoverable technology solves the high bandwidth cost problem caused by the need to transmit message-signature pairs together in traditional blind signatures.Security analysis shows that the scheme satisfies correctness,unlinkability and unforgeability.Efficiency analysis shows that the scheme is more efficient than most message recoverable blind signature schemes.(3)An electronic voting system based on blind signatures is designed.The ECLPB scheme and the FCLBSMR scheme are applied in the electronic voting system.And an electronic voting system based on blind signature is designed.The designed system achieves the privacy protection of voters’ identity information under the certificateless cryptosystem.The partially blindness of the ECLPB scheme can guarantee the anonymity of voter on the premise that the ballot is compliant.The message recoverable of the FCLBSMR scheme allows the voters only transmit the signature which as the voting certificate.Thus,the communication bandwidth overhead of the system is reduced.