Survey on blockchain privacy protection techniques in cryptography
Survey on blockchain privacy protection techniques in cryptography
Abstract
In recent years, data privacy issues have become increasingly obvious, and how to achieve effective privacy protection in blockchain has become a hot research topic. In view of the current research status and development trend of privacy protection in blockchain, this paper expounds the privacy protection methods of blockchain in transaction addresses, oracles and smart contracts, and summarizes the privacy strategies of blockchain in protecting basic elements. Based on high-level literature at home and abroad, this paper analyzes two types of blockchain cryptography protection methods and usage scenarios: special cryptography primitives and post-quantum cryptography, summarizes their research ideas, and gives attribute-based encryption, special data signatures, homomorphism The advantages and disadvantages of cryptographic technologies suitable for blockchain privacy protection, such as encryption, secure multi-party computation, zero-knowledge proof, and lattice cryptography, are concluded. The privacy protection of blockchain applications is inseparable from the support of cryptographic technology. Regarding the blockchain privacy protection technology, an analysis was conducted from two aspects: basic element protection and cryptographic protection. It was concluded that it is difficult to effectively solve privacy issues only from the application layer and contract layer of the blockchain. It is also necessary to use various cryptography Technologies complement each other's advantages based on different needs and application scenarios. According to the current development status of blockchain privacy encryption technology, this article starts with the protection of basic elements of blockchain and protection based on cryptography. From the two perspectives of endogenous basic element security and exogenous cryptographic privacy security, we first study basic element privacy protection, and then conduct an in-depth analysis of blockchain privacy cryptographic protection technology. In the corresponding protective measures, technology should be combined with practical application development. While considering the timeliness of the technology, we should also measure its advantages, disadvantages and potential value in terms of privacy processing. It looks forward to the future development direction of blockchain privacy protection technology and explains the key issues that need to be solved.
In recent years, the issue of data privacy has attracted increased attention, and how to achieve effective privacy protection in blockchain is a new research hotspot.In view of the current research status and development trend of blockchain in privacy protection, the privacy protection methods of blockchain in transaction address,prophecy machine and smart contract were explained, and the privacy strategies of blockchain in the protection of basic elements were summarized.Based on high-level literature at home and abroad, two types of blockchain cryptographic protection methods and usage scenarios were analyzed, including special cryptographic primitives and post-quantum cryptography.The advantages and disadvantages of seven cryptographic techniques applicable to current blockchain privacy protection were also reviewed, including attribute-based encryption, special data signature, homomorphic encryption, secure multi-party computation, zero-knowledge proofs, and lattice ciphers.It was concluded that the privacy protection of blockchain applications cannot be achieved without cryptographic technology.Meanwhile, the blockchain privacy protection technologies were analyzed in terms of both basic element protection and cryptographic protection.It was concluded that it was difficult to effectively solve the privacy problem only from the application and contract layers of the blockchain, and various cryptographic technologies should be used to complement each other according to different needs and application scenarios.In addition, according to the current development status of blockchain privacy cryptography, the narrative was developed from blockchain basic element protection and cryptography-based protection.From the perspectives of both endogenous basic element security and exogenous cryptographic privacy security, basic element privacy protection should be studied first, followed by an in-depth analysis of cryptographic protection techniques for blockchain privacy.The strengths and weaknesses and the potential value of the privacy handling aspects of the corresponding safeguards should be measured in terms of the development of technology in conjunction with practical applications, while considering the timeliness of the technology.Finally, an outlook on the future direction of blockchain privacy protection technologies was provided, indicating the issues that need to be addressed in focus.