Cryptology ePrint Archive: Report 2016/679

Hybrid WBC: Secure and Efficient White-Box Encryption Schemes

Jihoon Cho and Kyu Young Choi and Orr Dunkelman and Nathan Keller and Dukjae Moon and Aviya Vaidberg

Abstract: White-box cryptography aims at providing security against an adversary that has access to the encryption process. Numerous white-box encryption schemes were proposed since the introduction of white-box cryptography by Chow et al. in 2002. However, most of them are slow, and thus, can be used in practice only to protect very small amounts of information, such as encryption keys.

In this paper we present a new threat model for white-box cryptography which corresponds to the practical abilities of the adversary in a wide range of applications. Furthermore, we study design criteria for white-box primitives that are important from the industry point of view. Finally, we propose a class of new primitives that combine a white-box algorithm with a standard block cipher to obtain white-box protection for encrypting long messages, with high security and reasonable performance.

Category / Keywords: secret-key cryptography / white-box cryptography

Date: received 5 Jul 2016

Contact author: orrd at cs haifa ac il

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Version: 20160706:055439 (All versions of this report)

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