PORTABLE ELECTRONIC APPARATUS, LOCK RELEASE METHOD FOR NON-CONTACT IC, AND LOCK RELEASE SYSTEM FOR NON-CONTACT IC

PROBLEM TO BE SOLVED: To secure high security property in a portable electronic apparatus for releasing the lock of a non-contact function by using an external non-contact IC card.SOLUTION: A portable electronic apparatus includes: a reader/writer unit; a non-contact IC function unit; a storage unit; and a control unit. The control unit generates a first key and a second key when performing the lock of a non-contact IC, reads unique information from a non-contact IC card, encrypts the unique information with the first key to store the encrypted unique information in the storage unit, encrypts the first key with the second key, writes the encrypted first key in the non-contact IC card, and stores the second key in the storage unit. When releasing the lock of the non-contact IC, the control unit reads the unique information and the encrypted first key from the non-contact IC card, decrypts the read encrypted first key with the second key, decrypts the encrypted unique information by using the decrypted first key, and compares the decrypted unique information with the read unique information. When the both information is coincident, the control unit releases the lock of the non-contact IC.