Mobile communication terminal having a function of reading out information from contactless type communication tag and method for providing information of whether an article is genuine or not

A mobile communication terminal that receives information received from a contactless communication tag, the mobile communication terminal comprising:

• a communication unit, which wirelessly exchanges data with the contactless communication tag which is a physical device attached to a product and separated from the mobile communication terminal;
• a storing unit in which encryption keys information related to at least two encryption keys are stored;
• a decryption unit, which receives encryption key specifying information from the contactless communication tag, selects corresponding encryption key related information from said encryption keys information related to at least two encryption keys according to the encryption key specifying information, and decrypts data received from the contactless communication tag based on the selected encryption key related information;
• an information reading unit, which requests product information of the product from the contactless communication tag and reads the product information received from the contactless communication tag;
• and
• an output unit, which outputs the read product information,
• wherein the decryption unit decrypts the product information received from the contactless communication tag, and the output unit displays or sounds the decrypted product information.