Patent ID: 6885877
Filing Date: 2005-04-26
Classification: G06Q,G07F

Abstract:
1. A portable communication device for communicating with a remote communication terminal the portable communication device being configured and arranged to be used in a digital money system, comprising: a remote communication interface interfacing radio-frequency communication with a remote communication terminal; a short-distance communication interface interfacing wireless communication with a communication terminal located at a point of transaction involving the use of digital money; inputting unit inputting data or instruction information to said portable communication device; a memory storing the data input by the inputting unit or data received via said remote communication interface and said short-distance communication interface; a display unit displaying the data input by said inputting unit or data received via said remote communication interface and said short distance communication interface; an enciphering circuit enciphering data to be transmitted to the remote communication terminal via said remote communication interface and data to be transmitted via said short-distance communication interface; a deciphering circuit deciphering data received from the remote communication terminal via said remote communication interface and data received via said short-distance communication interface; and a controlling unit controlling each of said remote communication interface, said short-distance communication interface, said inputting unit, said memory, said display unit, said enciphering circuit and said deciphering circuit; wherein said enciphering circuit and deciphering circuit are constituted by an enciphering/deciphering processor, and an enciphering and deciphering method used by said enciphering/deciphering processor is changed by changing software installed in said enciphering/deciphering processor.