How to repair ESIGN

Louis Granboulan

Paper 2002/074

How to repair ESIGN

Louis Granboulan

Abstract

The ESIGN signature scheme was provided with an inadequate proof of security. We propose two techniques to repair the scheme, which we name ESIGN-D and ESIGN-R. Another improvement of ESIGN is encouraged, where the public key is hashed together with the message. This allows to have a security proof in the multi key setting. Additionally, the lower security of ESIGN compared to RSA-PSS leads to suggest that a common public key is used for ESIGN and RSA-PSS, leaving to the signer the choice between fast signature or better security.

Note: The last revision includes a security proof based on claw-free permutations and a novel security assumption: Claw-AER.

Metadata

Available format(s): PS
Category: Public-key cryptography
Publication info: Published elsewhere. SCN'02 - Third Conference on Security in Communication Networks
Keywords: digital signature scheme proven security design techniques.
Contact author(s): Louis Granboulan @ ens fr
History: 2002-09-16: last of 4 revisions; 2002-06-07: received; See all versions
Short URL: https://ia.cr/2002/074
License: CC BY

BibTeX

@misc{cryptoeprint:2002/074,
      author = {Louis Granboulan},
      title = {How to repair {ESIGN}},
      howpublished = {Cryptology {ePrint} Archive, Paper 2002/074},
      year = {2002},
      url = {https://eprint.iacr.org/2002/074}
}