Research On Hybrid Signcryption Scheme In Heterogeneous Cryptography

With the development of science and technology,most operating systems need to operate across platforms,but the main keys of sender and receiver in the existing heterogeneous signcryption schemes are mostly the same,which cannot meet the actual demands.At the same time,most of the existing heterogeneous signcryption schemes are the communication between public key infrastructure(PKI)and identity-based cryptosystems(IBC),and the algorithms between other cryptosystems need to be studied.Moreover,with the development of the era of big data,arbitrarily long message encryption problem is increasingly highlighted.When using public key encryption algorithm to encrypt long messages,the efficiency is low and the communication cost is high,but the security is low when using symmetric encryption algorithm to encrypt long messages.To solve this problem,it needs a hybrid signcryption scheme with high security,high computational efficiency and low communication cost.Based on the above problems,we construct a hybrid signcryption scheme for heterogeneous signcryption system from IBC to certificateless cryptography(CLC)system,the security of cryptographic algorithm is improved by using different system master keys in heterogeneous signcryption;the symmetric encryption algorithm in the hybrid signcryption algorithm can encrypt large data and arbitrary long messages.The main research of this paper is as follows:(1)Hybrid signcryption scheme based on heterogeneous cryptosystem(HSSBHC)was constructed.This scheme can not only realize the sender and receiver to choose the way to generate their own key according to their trust in the key generation center in different cryptosystems,and the encryption of messages of any length is not limited,but also prove the confidentiality and unforgeability of the scheme under the random oracle model(ROM).(2)Hybrid blind signcryption scheme based on heterogeneous cryptosystems(HBSSBHC)was constructed.This scheme can not only realize the sender and receiver to choose the way to generate their own key according to their trust in the key generation center in different cryptosystems,and has the ability to encrypt any long message.As well as the signer's signature without knowing the content of the signature,realize the validity of the signature in the law and protect the privacy of the message owner.At the same time,the security satisfied by the scheme is proved under ROM.(3)Hybrid group signcryption scheme based on heterogeneous cryptosystems(HGSSBHC)was constructed.This scheme can not only realize the sender and receiver to choose the way to generate their own key according to their trust in the key generation center in different cryptosystems,and has the ability to encrypt any long message,and without replacement of group public key and user private key,users can dynamically join the group and implementation of broadcasting sends a message to multiple users,which greatly improves the efficiency and reduces the cost of communication.In order to improve the security of the scheme,the unsigncryption can only be completed by group members cooperating with each other.At the same time,the confidentiality and unforgeability of the scheme can be proved under ROM.