Paper 2017/061
Short Digital Signatures and ID-KEMs via Truncation Collision Resistance
Tibor Jager and Rafael Kurek
Abstract
Truncation collision resistance is a simple non-interactive complexity assumption that seems very plausible for standard cryptographic hash functions like SHA-3. We describe how this assumption can be leveraged to obtain standard-model constructions of public-key cryptosystems that previously seemed to require a programmable random oracle. This includes the first constructions of identity-based key encapsulation mechanisms (ID-KEMs) and digital signatures over bilinear groups with full adaptive security and without random oracles, where a ciphertext or signature consists of only a single element of a prime-order group. We also describe a generic construction of ID-KEMs with full adaptive security from a scheme with very weak security ("selective and non-adaptive chosen-ID security"), and a similar generic construction for digital signatures.
Metadata
- Available format(s)
-
PDF
- Publication info
- Preprint. MINOR revision.
- Keywords
- Identity-based encryptiondigital signaturesrandom oracle modelextremely lossy functionsprovable security
- Contact author(s)
- tibor jager @ upb de
- History
- 2018-09-03: last of 5 revisions
- 2017-01-31: received
- See all versions
- Short URL
- https://ia.cr/2017/061
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2017/061,
author = {Tibor Jager and Rafael Kurek},
title = {Short Digital Signatures and ID-KEMs via Truncation Collision Resistance},
howpublished = {Cryptology ePrint Archive, Paper 2017/061},
year = {2017},
note = {\url{https://eprint.iacr.org/2017/061}},
url = {https://eprint.iacr.org/2017/061}
}
