RSA and redactable blockchains. Issue 1 (2nd January 2021)

• Record Type: Journal Article
• Authors: Grigoriev, Dima; Shpilrain, Vladimir
• Is Part Of: International journal of computer mathematics. Volume 6:Issue 1(2021)
• Page Start: 1
• Page End: 6
• Publication Date: 2021-01-02
• Subjects: Blockchain -- redactable blockchains -- RSA -- internet of things -- authenticated data structures; 94A62; Computer systems -- Periodicals; Computer systems; Periodicals; 004
• DOI: 10.1080/23799927.2020.1842808
• Languages: English
• ISSNs: 2379-9927

Abstract

Abstract : A blockchain is redactable if a private key holder (e.g. a central authority) can change any single block without violating integrity of the whole blockchain, but no other party can do that. In this paper, we offer a simple method of constructing redactable blockchains inspired by the ideas underlying the well-known RSA encryption scheme. Notably, our method can be used in conjunction with any reasonable hash function that is used to build a blockchain. Public immutability of a blockchain in our construction is based on the computational hardness of the RSA problem and not on properties of the underlying hash function. Corruption resistance is based on the computational hardness of the discrete logarithm problem.