Attacks of Modified White-box AES Implementations

• 영문명: 변형 화이트박스 고급 암호화 표준 구현 공격
• 발행기관: 대구과학대학교 국방안보연구소
• 저자명: 김홍태(Kim, Hong Tae)
• 간행물 정보: 『사회융합연구』제5권 제2호, 1~13쪽, 전체 13쪽
• 주제분류: 복합학 > 학제간연구
• 파일형태: PDF
• 발행일자: 2021.04.30

영문 초록

White-box cryptography is a cryptographic implementation technique that protects the decryption key even if the attacker has access to the entire decryption process. It is a cryptographic technique applicable to digital rights management. Chow et al. proposed a white-box AES implementation adding extra data on AES. Their implementation was attacked by Billet et al. in time complexity 230. In this paper, we present new white-box AES implementations using different types of encodings. We generalize the previous attacks to this modified white-box AES implementations with various encodings. Through the analysis, we show that the attack complexity increases to 248 when 16-bit encoding functions are used, and further into 284 when the output of the 16-bit encoding function is used as an input of three S-boxes.

목차

1. Introduction

2. Preliminaries

3. Cryptanalysis of Uniform Encoding Size Model

4. Cryptanalysis of Arbitrary Encoding Size Model

5. Conclusion

키워드

White– box cryptography Advanced Encryption Standard (AES) Implementation Attack Complexity