Paper 2024/1346
Provably Secure Online Authenticated Encryption and Bidirectional Online Channels
Abstract
In this work, we examine online authenticated encryption with variable expansion. We follow a notion where both encryption and decryption are online, and security is ensured in the RUP (Release of Unverified Plaintext) setting. Then we propose a generic way of obtaining an online authenticated encryption mode from a tweakable online encryption mode based on the encode-then-encipher paradigm (Bellare and Rogaway, Asiacrypt 2000). To instantiate our generic scheme, we start with proposing a provably-secure tweakable online encryption mode called t-OleF, a tweakable version of OleF (Bhaumik and Nandi, ToSC 2016(2)), and then plug it into our generic scheme to obtain OlÆF, a provably-secure online authenticated encryption mode. As an application, we propose a primitive we call a bidirectional online channel suited for communication between lightweight devices.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. Minor revision. SAC 2024
- Keywords
- online authenticated encryptiontweakable online cipherbidirectional online channelOleFt-OleFOlÆFINT-RUP
- Contact author(s)
-
bhattacharjeearghya29 @ gmail com
bhaumik ritam @ gmail com
colli594 @ purdue edu
mridul nandi @ gmail com - History
- 2024-08-30: revised
- 2024-08-28: received
- See all versions
- Short URL
- https://ia.cr/2024/1346
- License
-
CC BY-NC-SA
BibTeX
@misc{cryptoeprint:2024/1346,
author = {Arghya Bhattacharjee and Ritam Bhaumik and Daniel Collins and Mridul Nandi},
title = {Provably Secure Online Authenticated Encryption and Bidirectional Online Channels},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/1346},
year = {2024},
url = {https://eprint.iacr.org/2024/1346}
}