Verified Multiple-Time Signature Scheme from One-Time Signatures and Timestamping

Denis Firsov, Henri Lakk, and Ahto Truu

Abstract

 

In this paper, we construct a stateless tag system with efficient key generation from one-time signature schemes. We prove that the proposed tag system is forward-resistant and when combined with cryptographic timestamping, it induces a secure (existentially unforgeable) multiple-time signature scheme. Our constructions are developed and verified using the EasyCrypt framework.

 

[code, paper]