Random numbers are widely used in information technologies such as security, simulation, and machine learning. With the development of information technology, there is a need for technology to provide high-quality random numbers at higher speeds and at lower cost. Magnetic domain patterns of magnetic garnets are promising noise source for random number generators because they are unpredictable in terms of both chaos and quantum theory, and can be digitized at high speed by image sensors. Random numbers were generated based on the magnetic domain images and were passed randomness test (NIST SP800-22).
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