Paper 2026/1092 Original: eprint.iacr.org/2026/1092 ↗
The Equivalence of Two Quadratic Based IBEs
Abstract
In this short note, we show that two identity-based encryption schemes, introduced by Joye and Zhao et al., which appear different, are essentially the same scheme. The only difference between them is that one prioritizes speed (Zhao et al.), while the other prioritizes bandwidth (Joye). We also show how to speed-up Joye's scheme at the cost of adding at most one integer to the public key, thereby achieving a better encryption complexity, while having the same bandwidth requirements.
Metadata
- Available format(s)
PDF- Category
- Public-key cryptography
- Publication info
- Preprint.
- History
- 2026-08-06: last updated
- 2026-05-29: published
- Short URL
- https://ia.cr/2026/1092
- License
- https://creativecommons.org/licenses/by-nc-sa/4.0/
BibTeX
@misc{cryptoeprint:2026/1092,
author = {George Teseleanu},
title = {The Equivalence of Two Quadratic Based IBEs},
howpublished = {Cryptology {ePrint} Archive, Paper 2026/1092},
year = {2026},
url = {https://eprint.iacr.org/2026/1092}
}