Towards Fresh Re-Keying with Leakage-Resilient PRFs: Cipher Design Principles and Analysis
Leakage-resilient cryptography aims at developing new algorithms for which physical security against side-channel attacks can be formally analyzed. Following the work of Dziembowski and Pietrzak at FOCS 2008, several symmetric cryptographic primitives have been investigated in this setting. Most of them can be instantiated with a block cipher as underlying component. Such an approach naturally raises the question whether certain block ciphers are better suited for this purpose. In order to answer this question, the authors consider a leakage-resilient rekeying function, and evaluate its security at different abstraction levels.