Abstract: The present invention provide a method and a detection circuit for detecting a security chip operating slate. The detection circuit includes: a first register unit, a triggering unit, a delay unit, a routing unit, and a second register unit, where the second register unit is connected to the triggering unit. A first signal is delayed in the delay unit, to obtain a second signal, a third signal is obtained according to the second signal, and logical operation is performed on the first signal and the third signal, to output a level signal to trigger an alarm unit. Because each unit may be implemented by using a digital circuit, a size of the circuit can be reduced.

Abstract: The disclosure describes a security system, including a security element and a clock randomization processing unit. The clock randomization processing unit is configured to: receive a clock signal, randomly change arrangement of high-level steps or low-level steps in the clock signal, and provide a changed clock signal to the security element. The security system in an embodiment of the present invention first performs randomization processing on the clock signal before inputting the clock signal to the security element, and then inputs a randomized clock signal to the security element. The randomized clock signal causes a module inside the security element to work irregularly. Therefore, it is much more difficult to perform analysis in a side-channel attack, and a security capability of the security element is improved.

Abstract: The present invention provide a method and a detection circuit for detecting a security chip operating slate. The detection circuit includes: a first register unit, a triggering unit, a delay unit, a routing unit, and a second register unit, where the second register unit is connected to the triggering unit. A first signal is delayed in the delay unit, to obtain a second signal, a third signal is obtained according to the second signal, and logical operation is performed on the first signal and the third signal, to output a level signal to trigger an alarm unit. Because each unit may be implemented by using a digital circuit, a size of the circuit can be reduced.