In this paper we propose a new cryptanalytic method against block ciphers, which combines both algebraic and statistical techniques. More specifically, we show how to use algebraic relations arising from differential characteristics to speed up and improve key-recovery differential attacks against block ciphers in some situations. To illustrate the new technique, we apply it to reduced round ve...

A new general method for designing key-dependent reversible circuits is proposed and concrete examples are included. The method is suitable for data scrambling of internal links and memories on smart card chips in order to foil the probing attacks. It also presents a new paradigm for designing block ciphers suitable for small-size and/or high-speed hardware implementations. In particular, a con...

A method for extracting cryptographic key material from DRAM used in modern computers has been recently proposed in [9]; the technique was called Cold Boot attacks. When considering block ciphers, such as the AES and DES, simple algorithms were also proposed in [9] to recover the cryptographic key from the observed set of round subkeys in memory (computed via the cipher’s key schedule operation...

We cryptanalyse some block cipher proposals that are based on dedicated hash functions SHA-1 and MD5. We discuss a related-key attack against SHACAL-1 and present a method for finding “slid pairs” for it. We also present simple attacks against MDC-MD5 and the Kaliski-Robshaw block cipher.