An analysis of post-processing circuits based on a linear feedback shift register is carried out. A modification of the random number post-processing circuit using a multi-input signature analyzer is proposed, which employs a time compression factor and a variable number of entropy sources. The influence of the circuit’s key parameters on the entropy of processed sequences and on the results of NIST 800-22 statistical tests is analyzed. The hardware costs of implementing the circuit on programmable logic integrated circuits are estimated, and a comparison with similar circuits is performed. The results confirm the circuit’s potential for use in energyefficient and area-efficient true random number generators.

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