[Resource Topic] 2016/1174: Revisiting Full-PRF-Secure PMAC and Using It for Beyond-Birthday Authenticated Encryption

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Title:
Revisiting Full-PRF-Secure PMAC and Using It for Beyond-Birthday Authenticated Encryption

Authors: Eik List, Mridul Nandi

Abstract:

This paper proposes an authenticated encryption scheme, called SIVx, that preserves BBB security also in the case of unlimited nonce reuses. For this purpose, we propose a single-key BBB-secure message authentication code with 2n-bit outputs, called PMAC2x, based on a tweakable block cipher. PMAC2x is motivated by PMAC_TBC1k by Naito; we revisit its security proof and point out an invalid assumption. As a remedy, we provide an alternative proof for our construction, and derive a corrected bound for PMAC_TBC1k.

ePrint: https://eprint.iacr.org/2016/1174

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