Instruction-Fetching Attack and Practice in Collision Fault Attack on AES

A Fault Attack (FA) is performed mainly under the data corruption model and poses a threat to security chips. Instruction can enact same purpose at behavioral level, which produced by interfering with instruction system. Laser Injection (LFI) on program memory during instruction-fetching process, we refer as an attack, studied in this paper. This process bears ability produce controllable fault. Our work shows implementation of attack its specific application case 8-bit microcontroller. The main contributions paper include: (1) We have mapped sensitive areas precisely faulted instructions via laser injection implemented tampering. (2) Collision (CFA) scheme based fault proposed. (3) impacts are fully explored, including influence subsequent operations key recovery. (4) mechanism on-chip Flash further investigated. Instruction-fetching means that controller fetches tampered from external interference, likely gives rise invalid or incorrect operation. experiment confirms induce particular types faults different realize, e.g., byte-fault CFA. realization, discussed detail.