Cryptology ePrint Archive: Report 2019/329

Doubly half-injective PRGs for incompressible white-box cryptography

Estuardo Alpirez Bock and Alessandro Amadori and Joppe W. Bos and Chris Brzuska and Wil Michiels

Abstract: White-box cryptography was originally introduced in the setting of digital rights management with the goal of preventing a user from illegally re-distributing their software decryption program. In recent years, mobile payment has become a popular new application for white-box cryptography. Here, white-box cryptography is used to increase the robustness against external adversaries (i.e., not the user) who aim to misuse/attack the cryptographic functionalities of the payment application. A necessary requirement for secure white-box cryptography is that an adversary cannot extract the embedded secret key from the implementation. However, a white-box implementation needs to fulfill further security properties in order to provide useful protection of an application. In this paper we focus on the popular property incompressibility that is a mitigation technique against code-lifting attacks. We provide an incompressible white-box encryption scheme based on the standard-assumption of one-way permutations whereas previous works used either public-key type assumptions or non-standard symmetric-type assumptions.

Category / Keywords: secret-key cryptography / White-box cryptography, Incompressibility, One-way permutations

Original Publication (with minor differences): CT-RSA 2019

Date: received 26 Mar 2019

Contact author: estuardo alpirezbock at gmail com,chris brzuska@aalto fi

Available format(s): PDF | BibTeX Citation

Version: 20190329:131818 (All versions of this report)

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