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Title:
Provably Secure Online Authenticated Encryption and Bidirectional Online Channels
Authors: Arghya Bhattacharjee, Ritam Bhaumik, Daniel Collins, Mridul Nandi
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.
ePrint: https://eprint.iacr.org/2024/1346
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