Date: 20 Sep 2001

Fast Primitives for Internal Data Scrambling in Tamper Resistant Hardware


Although tamper-resistant devices are specifically designed to thwart invasive attacks, they remain vulnerable to micro-probing. Among several possibilities to provide data obfuscations, keyed hardware permutations can provide compact design and easy diversification. We discuss the efficiency of such primitives, and we give several examples of implementations, along with proofs of effectively large key-space.