Cryptology ePrint Archive: Report 2020/1153

Key Committing AEADs

Shay Gueron

Abstract: This note describes some methods for adding a key commitment property to a generic (nonce-based) AEAD scheme. We analyze the the privacy bounds and key commitment guarantee of the resulting constructions, by expressing them in terms of the properties of the underlying AEAD scheme and the added key commitment primitive. We also offer concrete constructions for a key committing version of AES-GCM.

Category / Keywords: secret-key cryptography / AEAD, Robust encryption, key commitment

Date: received 21 Sep 2020, last revised 21 Sep 2020

Contact author: shay gueron at gmail com

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Version: 20200925:183744 (All versions of this report)

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