Paper 2013/361
Linearly Homomorphic Structure-Preserving Signatures and Their Applications
Benoit Libert, Thomas Peters, Marc Joye, and Moti Yung
Abstract
Structure-preserving signatures (SPS) are signature schemes where messages, signatures and public keys all consist of elements of a group over which a bilinear map is efficiently computable. This property makes them useful in cryptographic protocols as they nicely compose with other algebraic tools (like the celebrated Groth-Sahai proof systems). In this paper, we consider SPS systems with homomorphic properties and suggest applications that have not been provided before (in particular, not by employing ordinary SPS). We build linearly homomorphic structure-preserving signatures under simple assumptions and show that the primitive makes it possible to verify the calculations performed by a server on outsourced encrypted data (i.e., combining secure computation and authenticated computation to allow reliable and secure cloud storage and computation, while freeing the client from retaining cleartext storage). Then, we give a generic construction of non-malleable (and actually simulation-sound) commitment from any linearly homomorphic SPS. This notably provides the first constant-size non-malleable commitment to group elements.
Note: Fixed one issue in Appendix B
Metadata
- Available format(s)
-
PDF
- Category
- Public-key cryptography
- Publication info
- Published elsewhere. Crypto 2013 -- This is the full version
- Keywords
- Structure-preserving cryptographysignatureshomomorphismcommitment schemesnon-malleability
- Contact author(s)
- benoit libert @ technicolor com
- History
- 2013-07-17: last of 2 revisions
- 2013-06-10: received
- See all versions
- Short URL
- https://ia.cr/2013/361
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2013/361,
author = {Benoit Libert and Thomas Peters and Marc Joye and Moti Yung},
title = {Linearly Homomorphic Structure-Preserving Signatures and Their Applications},
howpublished = {Cryptology {ePrint} Archive, Paper 2013/361},
year = {2013},
url = {https://eprint.iacr.org/2013/361}
}
