A New Design of Hardware Trojan Based on Path Delay

Abstract

A new design method of hardware Trojan based path delay is proposed, the trigger of the Trojan is designed by using the meta-stability of flip-flop. Compared with the traditional hardware Trojan, the path delay Trojan can’t change the circuit function, and can effectively avoid the function equivalence detection, so it has a very high concealment. Inserted path delay Trojan in the AES (Advanced Encryption Standard) circuit, then successfully got the key with the frequency attack. After analyzed the leakage probability of key under different working frequency and different delay structure, obtained an effective method to control the trigger rate of path delay Trojan.