Patent ID: 7558704

Claim:
A measuring device for generating measurement data by continuously recording measurement information, the measuring device comprising: a data dividing unit configured to generate divided data items by dividing the measurement data into predetermined units, after the generating the measurement data by continuously recording the measurement information is completed; a feature quantity acquiring unit configured to acquire feature quantities, each of the feature quantities identifying one of the divided data items generated by the data dividing unit; a time stamp acquiring unit configured to acquire a time stamp based on measurement time data, the measurement time data including the feature quantities and measurement time identification information of each of the divided data items, and the measurement time identification information defining a measurement time of each of the divided data items on a predetermined time axis; a signature generating unit configured to generate an electronic signature for the measurement time data and the time stamp by encrypting, using a private key specific to the measuring device, a hash value, wherein the hash value is calculated from the time stamp and a hash list including the feature quantities and corresponding relative start and end times; and a saving unit configured to save the measurement time data, the time stamp, and the electronic signature in association with the measurement data.