Paper 2024/103
ChaCha related 64 bit oriented ARX cipher
Abstract
A cipher scheme related to ChaCha [Ber] with the variation of using 64 bit operations instead of 32 bits, and the same 512 bit state size, is presented. We will provide strong argumentation to assert that the same security of ChaCha can be obtained with less number of instructions for 24 rounds, instead of Chacha's 20 rounds. Also, an strategy to implement this cipher on SIMD extensions is presented, with a maximal throughput of about 4 bytes per cycle on a 256 bit SIMD extension with at least 11 vector registers.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Preprint.
- Keywords
- ChachaARX64 bit
- Contact author(s)
- daniel nager @ gmail com
- History
- 2024-02-06: revised
- 2024-01-23: received
- See all versions
- Short URL
- https://ia.cr/2024/103
- License
-
CC0
BibTeX
@misc{cryptoeprint:2024/103,
author = {Daniel Nager},
title = {ChaCha related 64 bit oriented ARX cipher},
howpublished = {Cryptology ePrint Archive, Paper 2024/103},
year = {2024},
note = {\url{https://eprint.iacr.org/2024/103}},
url = {https://eprint.iacr.org/2024/103}
}
