A high stability strong physical unclonable function circuit and its design method

Abstract

The present invention is applicable to the field of information security and the field of integrated circuits, and provides a high-stability strongly physically unclonable function circuit and a design method thereof. The physically unclonable function circuit includes: a delay generation module for The input excitation of the clone function circuit propagates the same jump through multiple delay paths, and generates multiple delay values ​​at the same time; the delay comparison module is used to select multiple pairs of delay values ​​from multiple delay values ​​for comparison. The time delay difference is compared, and the time delay difference of each pair of time delay values ​​is divided into multiple levels according to the size; the response calculation module is used to calculate the strong physical unclonable function circuit according to the time delay difference level of each pair of time delay values output response; a stability judging module, used to judge whether the stimulus-response pair is stable or not according to the time-delay difference level of each pair of time-delay values. While ensuring the attack resistance of the strong physical unclonable function circuit, the invention can measure the time delay difference online in real time, thereby greatly improving the stability.

Description

technical field [0001] The invention relates to the field of information security and the field of integrated circuits, and belongs to a hardware security design method, in particular to a high-stability strong physical unclonable function circuit and a design method thereof. Background technique [0002] In recent years, with the widespread use of electronic devices, security and privacy have become important issues. Keys that are believed to be permanently stored and unknown to attackers are the core of traditional cryptography, however, many attack methods have been able to crack the keys, which makes the keys insufficient to guarantee security. In order to effectively solve the security problem, Physical Unclonable Function (PUF) emerges as the times require, which is a hardware component that can deal with security problems more effectively. [0003] PUF utilizes the inevitable process deviation during chip manufacturing to generate a specific input-output pair, which ...

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Problems solved by technology

[0014] (1) The delay value is a value distributed in the real number field, and the PUF response is a binary logic of 0 or 1. Therefore, in the process of converting the delay difference into a binary logic, there is inevitably information loss. Information loss is one of the important reasons for unstable response

[0015] (2) When the delay values ​​of the two delay paths are very close, the response will not be stable. This is because the delay difference is very small, and changes in the working environment such as power supply voltage and temperature can easily lead to delay differences. Sometimes it is positive and sometimes it is negative, so that the response is sometimes 0 and sometimes 1

[0017] In summary, there are obviously inconveniences and defects in the actual use of the existing technology, so it is necessary to improve

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