Cryptology ePrint Archive: Report 2017/877

Identity-Based Format-Preserving Encryption

Mihir Bellare and Viet Tung Hoang

Abstract: We introduce identity-based format-preserving encryption (IB-FPE) as a way to localize and limit the damage to format-preserving encryption (FPE) from key exposure. We give definitions, relations between them, generic attacks and two transforms of FPE schemes to IB-FPE schemes. As a special case, we introduce and cover identity-based tweakable blockciphers. We apply all this to analyze DFF, an FPE scheme proposed to NIST for standardization.

Category / Keywords: secret-key cryptography / identity-based cryptography, format-preserving encryption, tweakable blockcipher, ideal-cipher model, pseudorandom function

Original Publication (with major differences): ACM Computer and Communications Security Conference 2017

Date: received 9 Sep 2017

Contact author: mihir at eng ucsd edu

Available format(s): PDF | BibTeX Citation

Version: 20170913:212916 (All versions of this report)

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