Positional information storage system and method, semiconductor memory, and program

A positional information storage system comprising:

• a transmission apparatus;
• the communication terminal apparatus;
• a mobile semiconductor memory including an information storage unit, which has an area for storing information, and a tamper-resistant module;
• and
• a verification apparatus, wherein
• the transmission apparatus is operable to transmit (i) element information concerning a position of the communication terminal apparatus and (ii) additional data which is generated by placing a digital signature on the element information, to the communication terminal apparatus,
• the communication terminal apparatus is operable to receive the element information and the additional data and output the element information and the additional data to the mobile semiconductor memory,
• the tamper-resistant module of the mobile semiconductor memory includes:
• a position management unit operable to, if verified by checking the additional data that the element information has not been tampered with, generate positional information based on the element information;
• a time acquiring unit operable to acquire generation time information that indicates a time related to the positional information;
• a signature generating unit operable to generate signature data by placing a digital signature on trail information that is composed of the generation time information and the positional information;
• and
• a writing unit operable to write the trail information and the signature data as corresponding to each other into the information storage unit, and
• the verification apparatus reads the trail information and the signature data from the information storage unit of the mobile semiconductor memory and verifies the trail information using the trail information and the signature data.

A mobile, tamper-resistant semiconductor memory for a communication terminal apparatus, the semiconductor memory comprising:

• an information storage unit which has an area for storing information;
• and
• a tamper resistant module including:
• a position management unit operable to receive element information from the communication terminal apparatus, the element information being related to a position of the communication terminal apparatus, and generate, based on the element information, positional information that indicates a position of the communication terminal apparatus;
• a time management unit operable to generate generation time information that indicates a time at which the positional information is generated;
• a signature generating unit operable to generate signature data by placing a digital signature on trail information that is composed of the generation time information and the positional information;
• and
• a writing unit operable to write the trail information and the signature data as corresponding to each other into the information storage unit.