Cryptanalysis of a White Box AES Implementation

The white box attack context as described in [1, 2] is the common setting where cryptographic software is executed in an untrusted environment—i.e. an attacker has gained access to the implementation of cryptographic algorithms, and can observe or manipulate the dynamic execution of whole or part of the algorithms. In this paper, we present an efficient practical attack against the obfuscated AES implementation [1] proposed at SAC 2002 as a means to protect AES software operated in the white box context against key exposure. We explain in details how to extract the whole AES secret key embedded in such a white box AES implementation, with negligible memory and worst time complexity 230 .

• Type: Conference
• Year: 2004
• Where: SACRYPT
• Authors: Olivier Billet, Henri Gilbert, Charaf Ech-Chatbi
• Keywords: AES Implementation, SACRYPT 2004, White Box, White Box Attack