Welcome to the resource topic for 2022/444
Title:
A White-Box Speck Implementation using Self-Equivalence Encodings (Full Version)
Authors: Joachim Vandersmissen, Adrián Ranea, Bart Preneel
Abstract:In 2002, Chow et al. initiated the formal study of white-box cryptography and introduced the CEJO framework. Since then, various white-box designs based on their framework have been proposed, all of them broken. Ranea and Preneel proposed a different method in 2020, called self-equivalence encodings and analyzed its security for AES. In this paper, we apply this method to generate the first academic white-box Speck implementations using self-equivalence encodings. Although we focus on Speck in this work, our design could easily be adapted to protect other add-rotate-xor (ARX) ciphers. Then, we analyze the security of our implementation against key-recovery attacks. We propose an algebraic attack to fully recover the master key and external encodings from a white-box Speck implementation, with limited effort required. While this result shows that the linear and affine self-equivalences of self-equivalence encodings are insecure, we hope that this negative result will spur additional research in higher-degree self-equivalence encodings for white-box cryptography. Finally, we created an open-source Python project implementing our design, publicly available at GitHub - jvdsn/white-box-speck: A white-box Speck implementation using self-equivalence encodings. We give an overview of five strategies to generate output code, which can be used to improve the performance of the white-box implementation. We compare these strategies and determine how to generate the most performant white-box Speck code. Furthermore, this project could be employed to test and compare the efficiency of attacks on white-box implementations using self-equivalence encodings.
ePrint: https://eprint.iacr.org/2022/444
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