Physical unclonable function generator and true random number generator

By applying a target magnetic field and flipping the synthetic antiferromagnetic layer in the magnetic tunnel junction storage cell, a physically unclonable function with high randomness and uniformity is generated. True random numbers are generated by using free layer bounce. This solves the problem of insufficient randomness and uniformity in the prior art, improves security and anti-attack capability, and reduces circuit complexity and power consumption.

CN121832886APending Publication Date: 2026-04-10TRUTH MEMORY CORP
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Patent Information

Application Number
CN202512014714.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-29
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Existing methods for generating physically unclonable functions rely on a 50% probability of flip current or thermal disturbance, resulting in insufficient randomness and uniformity in the device output response, making it difficult to guarantee the stability and security of physically unclonable functions.

Method used

Using magnetic tunnel junction storage cells, the magnetic moment direction of the free layer is made perpendicular or approximately perpendicular by applying a magnetic field in the target direction. Combined with the controllable flipping of the synthetic antiferromagnetic layer, a physically unclonable function with high randomness and uniformity is generated. True random numbers are generated by utilizing the nondeterministic bounce of the free layer.

Benefits of technology

It improves the randomness and uniformity of physically unclonable functions, enhancing their resistance to attacks and security, while reducing circuit logic complexity and power consumption, making it suitable for the high security and low power consumption requirements of IoT and edge devices.

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Abstract

The embodiment of the invention provides a physical unclonable function generator and a true random number generator. The physical unclonable function generator comprises a storage array and a control unit, a storage unit in the storage array comprises a magnetic storage device, and the magnetic storage device comprises a magnetic tunnel junction; the control unit is used for controlling the application of a magnetic field along a target direction to the storage array, and reading the resistance state of the storage unit to generate a physical unclonable function after the application of the magnetic field is stopped; wherein the target direction is perpendicular to or approximately perpendicular to the magnetic moment direction of the free layer in the magnetic tunnel junction in the in-plane direction, and the randomness and uniformity of the physical unclonable function are improved.
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