A reconfigurable puf construction method based on random magnetic domain wall movement

Abstract

The invention discloses a reconfigurable PUF construction method based on random magnetic domain wall movement, which belongs to the field of information security. Including: a reset current pulse is applied to the first pair of bottom electrodes of each non-volatile device in the device with SOT effect, and an external magnetic field is applied at the same time, so that the magnetic domain magnetization direction of the ferromagnetic layer in each non-volatile device is the same; the magnetic field is maintained Invariably, the first pair of bottom electrodes of each non-volatile device is fed with a set current pulse opposite to the direction of the reset current pulse, so that the magnetic domain walls of each non-volatile device move randomly; in each non-volatile device The first pair of bottom electrodes of the device is fed with a test current to read the abnormal Hall resistance of each non-volatile device; the abnormal Hall resistance of each non-volatile device array forming a device with SOT effect is converted into a binary code, thereby Realize reconfigurable PUF. The present invention utilizes the current or magnetic field to act on the magnetic domain wall to promote the random movement of the magnetic domain wall. The PUF has a simple structure, and the randomness, that is, the safety is guaranteed.

Description

technical field [0001] The invention belongs to the field of information security, and more specifically relates to a reconfigurable PUF construction method based on random magnetic domain wall movement. Background technique [0002] With the rapid development of the Internet of Things today, the information security of devices is very important. Compared with traditional encryption methods such as storing secret keys in memory, Physical Unclonable Function (PUF) has many advantages, such as small footprint, low power consumption, harder to be attacked, and lower cost. Therefore, PUF has become one of the research hotspots in the field of hardware security in recent years. [0003] PUF is derived from the inevitable differences in the manufacturing process of the device and the physical randomness inside the device, so PUF is difficult to be cloned and has high security. Applying a stimulus to a device will produce a unique and unpredictable response. For the same device, ...

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Problems solved by technology

However, its randomness comes from the uneven thickness of the magnesium oxide film layer. After one etching of magnesium oxide, the randomness of the structure is determined, and the PUF cannot be reconfigured.

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