Patent ID: 7295136

Claim:
A communication system with first and second electronic units communicably coupled to each other, the first electronic unit storing data, the communication system comprising: a transmitting module provided in the first electronic unit and configured to transmit to the second electronic unit first information indicative of a feature of the data stored in the first electronic unit in response to when the first electronic unit detects its shutdown state; a storing module provided in the second electronic unit and configured to receive the first information transmitted from the transmitting module and to store the received first information as second information; a first transmitting module provided in the first electronic unit and configured to transmit to the second electronic unit the first information in response to when the first electronic unit starts to operate; a receiving module provided in the second electronic unit and configured to receive the first information transmitted from the first transmitting module; and a comparing module provided in the second electronic unit and configured to compare the received first information with the second information to determine whether the data stored in the first electronic unit is tampered based on the compared result.