Research On Digital Signature Of Blockchain For Information Non-repudiation

Blockchain technology has gradually become a key technology for many industries and applications over time.How to effectively protect information security has become an important part that has to be faced in today's various applications built using blockchain systems with increasingly complex and huge data information.It is necessary to use information security technologies such as digital signature,identity authentication and time stamp to defend against attacks that may tlhreaten the non-repudiation of information in different various blockchain applications.Therefore,this paper proposed a new digital signature scheme that can protect the non-repudiation of information in the blockchain system,which mainly includes the following contents:1.Firstly,the development history,basic concepts and the decentralization,openness,self-control,incomprehensible modification and anonymity of the blockchain system are described.Then it emphasized that the necessity and importance of protecting the information non-repudiation in the blockchain system.Then,the digital signature technology and the identity authentication technology are introduced in detail.Finally,the time stamp technology is briefly described.2.Two important mathematical theories in cryptography:elliptic curve discrete logarithm problem and bilinear mapping,are described in detail.Then the classical problems in elliptic curve cryptography are assumed,and the related theoretical methods and mathematical models,such as zero-knowledge proof and random oracle model are briefly introduced.They can build the security model and application environment needed to detect the proposed scheme.Then the digital signature techniques commonly used in blockchain systems are briefly introduced and analyzed based on their respective characteristics.According to the different digital signature schemes that have been proposed in the blockchain system,through the comparison of several principles such as algorithm principle,applicable scenario,scheme performance and security level provided,some existing security problems and limitations in performance have showed,and the direction of this thesis can be proposed.3.Proposed a digital signature scheme that can hide the amount of multiple inputs and outputs transactions.Then the feasibility of the scheme was proved by the the elliptic curve equation and the addition homomorphism rules.According to the security flaws of the original scheme,security optimization is proposed to prevent different kinds of security attacks on information non-repudiation that in Bitcoin trading system4.In order to further improve the security and ensure the performance of the original scheme,combined the characteristics of the aggregate signature scheme with the original signature scheme to build a new digital signature scheme,the new scheme can protect the hidden transactions from attack,and this scheme does not expand the space of digital signature,even if the system has multiple users,which ensured the operation performance.Construct a big data transaction model based on the blockchain system.The proposed new signature scheme was deployed in this big data transaction model,and the security and performance of the scheme are proved through formal analysis methods.Eventually,the advantages of the new signature scheme and the direction of further research can be further explored.