Paper 2015/1059

A General Framework for Redactable Signatures and New Constructions

David Derler, Henrich C. Pöhls, Kai Samelin, and Daniel Slamanig

Abstract

A redactable signature scheme (RSS) allows removing parts of a signed message by any party without invalidating the respective signature. State-of-the-art constructions thereby focus on messages represented by one specific data structure, e.g., lists, sets or trees, and adjust the security model accordingly. To overcome the necessity for this myriad of models, we present a general framework covering arbitrary data-structures and even more sophisticated possibilities. For example, we cover fixed elements which must not be redactable and dependencies between elements. Moreover, we introduce the notion of designated redactors, i.e., the signer can give some extra information to selected entities which become redactors. In practice, this often allows to obtain more efficient schemes. We then present two RSSs; one for sets and one for lists, both constructed from any EUF-CMA secure signature scheme and indistinguishable cryptographic accumulators in a black-box way and show how the concept of designated redactors can be used to increase the efficiency of these schemes. Finally, we present a black-box construction of a designated redactor RSS by combining an RSS for sets with non-interactive zero knowledge proof systems. All the three constructions presented in this paper provide transparency, which is an important property, but quite hard to achieve, as we also conceal the length of the original message and the positions of the redactions.

Note: Added missing abort condition in privacy definition.

Metadata
Available format(s)
PDF
Category
Cryptographic protocols
Publication info
Published elsewhere. MINOR revision.ICISC 2015
Keywords
redactable signaturesdesignated redactorsprivacytransparencygeneralized security modelblack-box constructions
Contact author(s)
david derler @ iaik tugraz at
History
2016-03-09: revised
2015-10-30: received
See all versions
Short URL
https://ia.cr/2015/1059
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2015/1059,
      author = {David Derler and Henrich C.  Pöhls and Kai Samelin and Daniel Slamanig},
      title = {A General Framework for Redactable Signatures and New Constructions},
      howpublished = {Cryptology ePrint Archive, Paper 2015/1059},
      year = {2015},
      note = {\url{https://eprint.iacr.org/2015/1059}},
      url = {https://eprint.iacr.org/2015/1059}
}
Note: In order to protect the privacy of readers, eprint.iacr.org does not use cookies or embedded third party content.