PUF unit supporting environmental perception, PUF and mixed PUF

Abstract

The invention discloses a PUF (Physical Unclonable Function) unit supporting environmental perception, a PUF and a hybrid PUF, which belong to the field of digital integrated circuit design and security and anti-counterfeiting. The PUF unit comprises a first basic PUF unit based on a ring oscillator and an off-chip circuit for perceiving external environment change, and the off-chip circuit is connected in series between the feedback loops of the first basic PUF unit. According to the invention, the off-chip circuit for sensing the change of the external environment is connected in series between the feedback rings of the first basic PUF unit; the corresponding parasitic RC value is changed due to the change of the external environment; the change of the parasitic RC value causes the difference of the delay of the off-chip circuit; the off-chip circuit delay is included in the total delay of the ring oscillator; the change of the time delay causes the change of the frequency of the PUFunit, thereby achieving the coupling of the external environment information into the PUF circuit, generating the unique output related to the environment change, causing the permanent failure of anoutput result through any attempt to change the external physical environment, and enabling the reconstruction not to be carried out.

Description

technical field [0001] The invention belongs to the field of digital integrated circuit design and security anti-counterfeiting, and more specifically relates to a PUF unit supporting environmental perception, a PUF and a hybrid PUF. Background technique [0002] Since the 21st century, with the rapid development of information technology, various smart cards, RFID, etc. have been widely used, as small as bank cards, bus cards, and even smart phones with built-in NFC. These physical entities have put forward high security requirements. Require. These physical entities are limited by their limited resources, computing power, and reproducibility, and it is difficult to meet high security certification and identification standards in terms of traditional cryptography. At present, fingerprint recognition, iris recognition or even voiceprint recognition based on unique biometric features is a safe and effective way to authenticate individuals. Benefiting from this idea, people h...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the existing PUF only produces results through in-chip process deviations and cannot be applied to the anti-counterfeiting problem in the off-chip environment, the present invention provides a PUF unit, PUF and hybrid PUF that support environmental awareness, and its purpose is to integrate specific physical environments outside the chip. The information is coupled to the internal PUF generation process. Any attempt to forge by disassembling the chip or destroying the external circuit will destroy the only physical environment in which the PUF is located, thus destroying the output of the PUF.

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