Two-way interference type identity verification system based on photorefractive crystal PUF

The invention discloses a two-way interference type identity authentication system based on a photorefractive crystal PUF, and relates to the field of information security and identity authentication. The system comprises a light intensity modulation module, a polarization beam splitting module, an optical PUF module and a light beam lens module which are sequentially arranged from left to right, and also comprises a data processing module, wherein the light intensity modulation module comprises a light source, a beam expanding collimation system (PBES) and a spatial modulator (SLM); the polarization beam splitting module comprises a polarization beam splitting prism (PBS); the optical PUF module is composed of two glass plates and zirconium-iron double-doped lithium niobate LiNbO3Fe, Zr granular crystals; the light beam lens module comprises a positive lens I, a 1/4 lambda wave plate and a reflector group; the reflector group is composed of a positive lens II and a concave mirror; and the data processing mod