Quality detecting method, random number generator, and electronic device

A random number generator comprising:

• a physical random number generation circuit;
• a first memory configured to store an upper limit value and a lower limit value that specify a distribution range of a score corresponding to at least one type for each of variant random number sequences generated by shuffling an initial random number sequence generated by the physical random number generation circuit;
• and
• a processor configured to perform processing by using the upper limit value and the lower limit value stored in the first memory, wherein
• the processor:
• calculates scores corresponding to the type for verification random number sequences generated by the physical random number generation circuit;
• compares the scores with the upper limit value and the lower limit value stored in the first memory;
• acquires, based on a comparison result, a frequency at which the scores of the verification random number sequences are distributed in the distribution range;
• and
• detects, based on the frequency, quality of the physical random number generation circuit.

An electronic device comprising:

• a random number generator;
• and
• an arithmetic device configured to perform processing by using a random number generated by the random number generator, wherein
• the random number generator includes:
• a physical random number generation circuit;
• a first memory configured to store an upper limit value and a lower limit value that specify a distribution range of a score corresponding to at least one type for each of variant random number sequences generated by shuffling an initial random number sequence generated by the physical random number generation circuit;
• and
• a processor configured to perform processing by using the upper limit value and the lower limit value stored in the first memory, wherein
• the processor:
• calculates scores corresponding to the type for verification random number sequences generated by the physical random number generation circuit;
• compares the scores with the upper limit value and the lower limit value, stored in the first memory;
• acquires, based on a comparison result, a frequency at which the scores of the verification random number sequences are distributed in the distribution range;
• and
• detects, based on the frequency, quality of the physical random number generation circuit.