Double-dynamic key encryption circuit and method capable of dynamically changing after dynamic key interpretation

Through the collaborative design of the dual dynamic key mechanism and state machine packets, the problem of dynamic keys being easily attacked in the existing technology is solved, and the keys still change dynamically after interpretation is realized, enhancing the security and attack resistance of the circuit.

CN120474691APending Publication Date: 2025-08-12ZHEJIANG UNIV
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Patent Information

Application Number
CN202510452748.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-11
Publication Date
2025-08-12

AI Technical Summary

Technical Problem

The existing logic locking technology has security risks when facing probe detection and bypass attacks. The dynamic keys are easily turned static after interpretation and are easily bypassed by attackers, resulting in the threat of the intellectual property security of IP design companies.

Method used

The dual dynamic key mechanism is adopted, through the synergy between the external dynamic key module and the internal dynamic key module, combined with the state machine grouping and linear feedback shift register unit, a dynamic key signal is generated, and the state machine jump is controlled using the D/T selection signal to ensure that the key still changes dynamically after interpretation.

Benefits of technology

Effectively resisting probe detection and bypass attacks, significantly improving the security of the circuit, enhancing the dynamic change characteristics of the key, expanding the attacker's search space, compressing the range of feasible solutions for the key, and improving the ability to resist attacks.

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Abstract

The invention belongs to the technical field of integrated circuit hardware security, and discloses a double-dynamic key encryption circuit and method for dynamically changing dynamic keys after interpretation, and the circuit comprises an external dynamic key module, an internal dynamic key module and a circuit original logic module. And the external dynamic key module generates a dynamic key signal through the linear feedback shift register unit, and the internal dynamic key module generates a D / T selection signal according to a parity check result of the dynamic key signal to dynamically change the type of a trigger in the state machine. The state machine is divided into a group A and a group B, key updating is triggered at an entrance state through a state detection unit, and it is ensured that the key is still dynamically changed after being interpreted. Through a double-dynamic key mechanism and state machine jump confusion, probe detection and bypass attacks are effectively resisted, and the safety of the circuit is remarkably improved. And when the initial key is wrong, circuit jump is abnormal, so that IP protection is realized. The method has the advantages of high attack resistance, dynamic key change, high security and the like.
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