A secure integrated circuit and a protection method thereof

A secure integrated circuit and a protection method thereof are provided. The secure integrated circuit includes functional circuitry, and protection circuitry configured to protect the functional circuitry against fault-injection attacks. The protection circuitry includes a plurality of digital detection cells, and protection logic. The detection cells have respective inputs and outputs and are connected output-to-input in at least a chain. In response to a fault-injection attack, a given detection cell in the chain is configured to toggle an output that drives an input of a subsequent detection cell in the chain, thereby causing a pulse to propagate along the chain. The protection logic is configured to receive the pulse from the chain and initiate a responsive action. 本发明提供一种安全集成电路及其保护方法，所述安全集成电路包括安全电路，以及被配置以保护功能电路免于缺陷注入攻击的保护电路。保护电路包括多个数字检测单元，以及保护逻辑。检测单元有相应的输入及输出，且以输出连接输入的方式形成至少一链路。为了对缺陷注入攻击做出反应，链路中给定的检测单元被配置以切换输出，该输出驱动链路中后续检测单元的输入，因此产生沿着链路传播的脉冲。保护逻辑被配置以从链路接收脉冲，以及启动保护反应动作。