High-stability strong physical unclonable function circuit and design method therefor

Abstract

The invention is suitable for the fields of information security and integrated circuits, and provides a high-stability strong physical unclonable function circuit and a design method therefor. The physical unclonable function circuit comprises a time delay generation module, a time delay comparison module, a response calculation module and a stability judgment module, wherein the time delay generation module is used for transmitting the same jump through a plurality of time delay paths according to an input stimulus of the strong physical unclonable function circuit and generating a plurality of time delay values; the time delay comparison module is used for selecting out multiple pairs of time delay values from the time delay values, performing time delay difference comparison and dividing the time delay differences of the pairs of time delay values into a plurality of grades according to difference values; the response calculation unit is used for calculating an output response of the strong physical unclonable function circuit according to the time delay difference grade of each pair of time delay values; and the stability judgment module is used for judging whether a stimulus response pair is stable or not according to the time delay difference grade of each pair of time delay values. According to the circuit and the method, while the attack resistance of the strong physical unclonable function circuit is ensured, the time delay difference can be measured online in real time, so that the stability is greatly improved.

Description

technical field [0001] The invention relates to the fields of information security and 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. The key that is considered to be permanently stored and unknown to the attacker is the core of traditional cryptography. However, many attack methods have been able to crack the key, which makes the key insufficient to ensure security. In order to effectively solve the security problem, Physical Unclonable Function (Physical Unclonable Function, PUF) emerges at the historic moment, it is a kind of hardware component, can deal with the security problem more effectively. [0003] The PUF uses the inevitable process deviation during chip manufacturing to generate a specific ...

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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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