Physical Unclonable Function Circuit Structure Based on Ring Oscillator

Abstract

The invention discloses a physical unclonable function circuit structure based on ring oscillators. The physical unclonable function circuit structure comprises the P+1 ring oscillators with the adjustable frequency and the same structure, P+1 counters with the length of M bits, a comparator with the length of M bits, a challenge register A with the length of N bits, a challenge register B with the length of M bits and a system enabling AND gate. All the ring oscillators with the adjustable frequency are connected with the challenge register A used for adjusting the frequency, the signal input end of each ring oscillator is connected with the signal output end of the system enabling AND gate, and the signal output end of each ring oscillator is connected with the signal input end of the corresponding counter; the counter 0 is a control counter, the output end of the counter 0 is connected with the inverted input end of the comparator, and the P output ends of the counters from 1 to P serve as response value output ends; the positive input end of the comparator is connected with the challenge register B, the output end of the challenge register B is connected with the signal input end of the system enabling AND gate, and the input end of the system enabling AND gate is further connected with system enabling signals.

Description

technical field [0001] The invention relates to a physically unclonable function circuit structure, in particular to a physically unclonable function circuit structure based on a ring oscillator. Background technique [0002] With the development and popularization of information technology, all aspects of people's life are developing in the direction of networking and intelligence, and various activities in social life are increasingly realized by electronic systems. ID cards, passports are digitized, Electronic financial transactions. At the same time, smart cards, USBKeys and other circuits implementing cryptographic algorithms are becoming more and more extensive, and these cryptographic devices are increasingly carrying personal and commercial confidential information. [0003] On the other hand, the development of chip cracking technology poses a great threat to chips used in the field of information security. Physical attack belongs to the traditional intrusive chip...

AI Technical Summary

Problems solved by technology

First, the oscillation frequency of each ring oscillator is fixed, and the challenge signal is only to select two of the P ring oscillator outputs for comparison. The randomness of the system is not high enough, and it is easy to be attacked by modeling; second, the two rings The vibration only determines the response bit by comparing the output. This judgment method ignores some frequency information, that is, it does not use the amplitude of the frequency difference, but only uses its magnitude.

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