Key Backup and Recovery for Resilient DID Environment

Abstract

This paper delves into the advantages of authentication algorithms employing self-sovereign identity, highlighting a reduced communication overhead and the elimination of single points of failure. However, it acknowledges the vulnerability of digital wallets to real-world issues like loss or theft. To address these challenges, we propose an efficient key backup and recovery protocol based on the FROST threshold signature algorithm. This protocol involves trusted third parties and backup devices, ensuring secure secret key sharing and rapid key recovery. Performance evaluations, including key recovery time, demonstrate the protocol’s efficiency and reliability, bolstering the overall robustness of self-sovereign identity systems.

Keywords

• FROST (flexible round-optimized Schnorr threshold signatures)
• interoperability technology of digital identification
• multi-party distributed signature
• universal digital wallet
• key backup
• key recovery