Welcome to the resource topic for 2024/1542
Title:
Robust AE With Committing Security
Authors: Viet Tung Hoang, Sanketh Menda
Abstract:There has been a recent interest to develop and standardize Robust Authenticated Encryption (Robust AE) schemes. NIST, for example, is considering an Accordion mode (a wideblock tweakable blockcipher), with Robust AE as a primary application. On the other hand, recent attacks and applications suggest that encryption needs to be committing. Indeed, committing security isalso a design consideration in the Accordion mode. Yet it is unclear how to build a Robust AE with committing security.
In this work, we give a modular solution for this problem. We first show how to transform any wideblock tweakable blockcipher TE to a Robust AE scheme SE that commits just the key. The overhead is cheap, just a few finite-field multiplications and blockcipher calls. If one wants to commit the entire encryption context, one can simply hash the context to derive a 256-bit subkey, and uses SE on that subkey. The use of 256-bit key on SE only means that it has to rely on AES-256 but doesn’t require TE to have 256-bit key.
Our approach frees the Accordion designs from consideration of committing security. Moreover, it gives a big saving for several key-committing applications that don’t want to pay the inherent hashing cost of full committing.
ePrint: https://eprint.iacr.org/2024/1542
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