Information processing apparatus capable of detecting falsification in programs, and falsification detecting method

A falsification detecting method executed in an information processing apparatus including a first storage portion and a connection portion, the first storage portion storing a first decryption key that is used to decrypt a first electronic signature, wherein the first electronic signature and a second electronic signature have been added to detection target programs that are expanded into a memory during a start-up of the information processing apparatus, the connection portion being configured to be connected with a second storage portion storing a second decryption key that is used to decrypt the second electronic signature and is different from the first decryption key, the falsification detecting method comprising:

• determining whether or not the second storage portion is connected to the connection portion;
• and
• when it has been determined that the second storage portion is not connected to the connection portion, detecting presence/absence of falsification in the detection target programs by using first decrypted data that is acquired by decrypting the first electronic signature by using the first decryption key, and when it has been determined that the second storage portion is connected to the connection portion, detecting presence/absence of falsification in the detection target programs by using second decrypted data that is acquired by decrypting the second electronic signature by using the second decryption key.