May 11, 2021

SpywareNews.com

Dedicated Forum to help removing adware, malware, spyware, ransomware, trojans, viruses and more!

ReTRACe: Revocable and Traceable Blockchain Rewrites using Attribute-based Cryptosystems, by Gaurav Panwar and Roopa Vishwanathan and Satyajayant Misra

In this paper, we study efficient and authorized rewriting of transactions already written to a blockchain. Mutable transactions will make a fraction of all blockchain transactions, but will be a necessity to meet the needs of privacy regulations, such as the General Data Protection Regulation (GDPR). The state-of-the-art rewriting approaches have several shortcomings, such as lack of user anonymity, inefficiency, and absence of revocation mechanisms. We present ReTRACe, an efficient framework for blockchain rewrites. ReTRACe is designed by composing a novel revocable chameleon hash with ephemeral trapdoor scheme, a novel revocable fast attribute based encryption scheme, and a dynamic group signature scheme. We discuss ReTRACe, and its constituent primitives in detail, along with their security analyses, and present experimental results to demonstrate the scalability of ReTRACe.