Physical unclonable function circuit

Abstract

The invention discloses a physical unclonable function circuit comprising n cascaded data delay circuits, n clock delay circuits and an arbitration device; control ends of the data delay circuits are used for receiving random control signals, first output ends and second output ends of the data delay circuits are respectively connected with first input ends and second input ends of the data delay circuits of a next grade, data ends of the n data delay circuits are orderly and respectively connected with input ends of n clock delay circuits, output ends of the clock delay circuits are connected with the arbitration device, and the arbitration device is used for determining output data according to signals output by the n clock delay circuits. Data delay deviation and clock delay deviation can be introduced at the same time via the circuit, mathematical modeling difficulty is increased, and therefore safety of the PUF circuit can be improved.

Description

technical field [0001] The invention relates to the technical field of chip security, in particular to a physical unclonable function circuit. Background technique [0002] With the large-scale use of security chips, the requirements for security and reliability of the security chips are getting higher and higher. In the process of using the security chip, identity identification, authentication and data integrity detection are all very important application tasks, and high requirements are also put forward for the security protection measures of the security chip in these aspects. [0003] Traditional security protection methods store digital keys (data encryption and decryption keys and keys of some common algorithms, such as DES, AES, etc.) in non-volatile memory, such as ROM / EEPROM. This kind of protection cannot provide absolute security protection, and the biggest vulnerability is the storage of keys. Attack methods aimed at obtaining, guessing, or cloning keys store...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a physical non-clonable function circuit, thereby overcoming the defect of uneven data delay deviation in the existing PUF circuit

Images