Paper 2021/528
Verified Multiple-Time Signature Scheme from One-Time Signatures and Timestamping
Denis Firsov, Henri Lakk, and Ahto Truu
Abstract
Buldas, Laanoja, and Truu designed a family of server-assisted digital signature schemes (BLT signatures) built around cryptographic timestamping and forward-resistant tag systems. The original constructions had either expensive key generation phase or stateful client-side computations. 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.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Published elsewhere. Minor revision. IEEE CSF 2021
- Keywords
- digital signaturesEasyCryptformalized cryptographytimestamping
- Contact author(s)
- denis firsov @ guardtime com
- History
- 2021-04-23: received
- Short URL
- https://ia.cr/2021/528
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2021/528,
author = {Denis Firsov and Henri Lakk and Ahto Truu},
title = {Verified Multiple-Time Signature Scheme from One-Time Signatures and Timestamping},
howpublished = {Cryptology ePrint Archive, Paper 2021/528},
year = {2021},
note = {\url{https://eprint.iacr.org/2021/528}},
url = {https://eprint.iacr.org/2021/528}
}
