The Design Of The Two Certificateless Aggregate Signature Scheme

With the widespread application of computer networks,people's various information and data are gradually electronic,which not only benefits mankind,but also exposes people's lives to great risks.For example,a relatively common problem,such as data exposure,data loss,etc.,which will cause more serious consequences.Digital sign-ature technology as an important research part of cryptography,with great research value,play an important role in network communication security protection.With the continuous development of digital signature technology,traditional signatures have not been able to meet the security needs in special fields.Aggregate signature is a kind of“batch”and“compression”technology in the field of digital signature,which can provide undeniable service to multiple messages and users at the same time,it can compress many signatures generated by different users into a single one,the verifier only needs to verify the aggregate signature instead of all the single signatures.Therefore,aggregate signature greatly improves the efficiency of signature verification and transmission.Certificateless aggregate signature scheme perfectly combines the advantages of certificateless cryptography with aggregate signatures,which not only reduce communication costs,but also avoids certificate storage and the key escrow problem.This paper focuses on data security,constructs two aggregate signature schemes with special properties under reasonable security model,and gives the application research of the schemes.The main work is as follows:1.A certificateless strong anonymous aggregate signature scheme for the Internet of Vehicle was designed,and the proposed scheme was proven to be anonymous and unforgeable in the random oracle model.At Present,most certificateless aggregate signature schemes about anonymity can resist only the attack from Type I adversary,while our scheme can resist the attack from a Super adversary A(A has the capacity of both₁A and A₂).Finally,the new scheme was compared with several related schemes,and the results show that the proposed scheme is more efficient and suit for the Internet of Vehicle.2.A strong designated multi-verifiers aggregate signature scheme based on cloud healthcare.In such a scheme,a signer can produce a designated multi-verifiers aggregate signature for a group of verifiers who will collaborate with each other to verify the signature with their secret key.And the verification ability of single verifier is reduced.Finally,the security proofs and performance analysis showed that the proposed scheme is secure and efficient.