Security and ticketing system control and management

A controlling method for controlling a security device for restricting multiple uses of signed data, the controlling method causing the security device to execute the steps of:

• reading a counter array out of an external nonvolatile storage unit and storing the counter array in a volatile storage unit, the external nonvolatile storage unit storing the counter array obtained by coupling a hash value generated for each signature key with a signature number counter configured to count the number of signatures performed by use of the signature key;
• reading the stored counter array configured to generate the hash value, and configured to move the hash value to a validity check unit for a validity check, and the immediately preceding hash value in the counter array;
• transmitting a message requesting a service, wherein the message is concatenated with a value of the signature number counter;
• calling up a signature function in response to a judgment of validity by the validity check unit;
• and
• updating a counter every time the signature function is called up.