Information processing apparatus

An information processing apparatus mounted on a vehicle, the information processing apparatus comprising a hardware processor configured to:

• execute a control program used to control the vehicle;
• generate a random number;
• and
• authenticate an update control device that controls update of the control program by using the generated random number,
• wherein the generating of the random number includes
• extracting a first bit value having a predetermined length from a count value of a first clock signal,
• acquiring, in a case where at least one bit position in an entropy stored in a buffer is designated as an update position, a bit value at the update position that is designated as a target bit value,
• performing a logical operation on the extracted first bit value and the acquired target bit value to obtain a result of the logical operation,
• replacing the bit value at the update position with the result of the logical operation,
• designating a new update position after the bit value at the update position is replaced with the result of the logical operation, and
• generating the random number from the entropy stored in the buffer and outputting the random number to authenticate the update control device.