A monitoring protection circuit for control signals
By introducing a signal monitoring and protection circuit into the security chip, abnormal changes in the SEN control signal can be monitored and responded to in real time, thus solving the security vulnerability of the security chip under attack and ensuring that sensitive data is not leaked.
CN115840967BActive Publication Date: 2026-06-02BEIJING TONGFANG MICROELECTRONICS
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING TONGFANG MICROELECTRONICS
- Filing Date
- 2021-09-18
- Publication Date
- 2026-06-02
Smart Images
Figure CN115840967B_ABST
Abstract
The application provides a kind of monitoring protection circuit of control signal, for protecting safety chip, the circuit includes: signal monitoring unit and alarm processing unit, wherein: the signal monitoring unit is used to detect the state of SEN control signal containing sensitive logic in real time, when safety chip is attacked, if the level of the SEN control signal is detected to occur abnormal mutation, then high level alarm signal is generated;The alarm processing unit is used to control the safety chip to respond and process according to the high level alarm signal, to strengthen the security mechanism of the safety chip.The application generates an alarm after the key signal is attacked and changed, and the related circuit responds to the alarm signal, takes over the system control signal of the chip, ensures that sensitive data will not be obtained by abnormal attack, so as to ensure the safety of the chip and avoid the problem that the related security measures are invalid due to the attack on the key signal.
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