An integrated circuit based on logical encryption and an encryption method thereof

Abstract

The invention relates to an integrated circuit based on logic encryption and an encryption method thereof. The invention includes that the signal flip rate of a node in the integrated circuit is determined; a low controllability node list is established according to the signal flip rate of the node, wherein the first low controllability node list comprises a plurality of low controllability nodes;updating a low controllability node list according to a critical path of the integrated circuit; acquiring a driving node according to the low controllability node in the updated low controllabilitynode list; the integrated circuit is encrypted according to the driver node to obtain an encrypted integrated circuit. The encryption method of the integrated circuit of the invention is a method fordefending hardware Trojan horse based on logic encryption. The invention avoids the low controllability node on the critical path and does not perform any treatment on the low controllability node, avoids inserting additional and useless circuits on the critical path, reduces the influence on the integrated circuit performance, and thus overcomes the problem that the prior art method of defendingthe hardware Trojan horse has great influence on the integrated circuit performance.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an integrated circuit based on logic encryption and an encryption method thereof. Background technique [0002] An integrated circuit (integrated circuit) is a tiny electronic device or component. Integrated circuits have the advantages of small size, light weight, fewer lead wires and soldering points, long life, high reliability, and good performance. At the same time, their cost is low and they are convenient for mass production. It is not only widely used in industrial and civil electronic equipment (such as radio recorders, televisions, computers), etc., but also in military affairs, communications, remote control, etc. [0003] In the design process of integrated circuits, untrusted third-party foundries can implant hardware circuits with malicious functions into integrated circuits without the designer's knowledge. This hardware circuit with malic...

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Problems solved by technology

[0004] However, the first method does not take into account the impact of the logic encryption circuit on the critical path of the integrated circuit when inserting the logic encryption circuit, thereby affecting the performance of the integrated circuit, and the first method does not take into account the low controllability of the integrated circuit The relationship between the nodes with low controllability is only processed independently for each node with low controllability. This method will repeatedly insert multiple logic encryption circuits on one path in the integrated circuit, thus bringing unnecessary problems to the integrated circuit. The area overhead of the integrated circuit also reduces the performance of the integrated circuit; the second method can avoid the coverage of the integrated circuit by the test vector because the untrusted third-party foundry can also use the optimized test vector to analyze the integrated circuit. In order to re-choose other positions that cannot be covered and implant hardware Trojan horses, this method cannot achieve the expected defense effect.

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