Abstract: A control board (1) comprises connectors (15-1, 15-2) being connectable to source driver boards (3-1, 3-2) via cables (2-1, 2-2) comprising a plurality of signal lines (22); and a control circuit (11). The control circuit (11) transmits a predetermined plurality of test data values to source driver boards (3-1, 3-2) via first signal lines of the plurality of signal lines (22). Based on one encoded data value being generated from a plurality of test data values by the source driver boards (3-1, 3-2), the control circuit (11) determines whether the plurality of test data values are correctly transmitted to the source driver boards (3-1, 3-2). The control circuit (11) outputs a signal indicating whether the plurality of test data values are correctly transmitted to the source driver boards (3-1, 3-2).

Abstract: A data processing apparatus is provided, which detects falsification of software to data and rewriting of the data. The data processing apparatus according to an embodiment of the present invention comprises a security unit which has an encryption circuit for decrypting an encrypted signal including secrecy data. The security unit includes a compression circuit which compresses an access signal used in accessing the security unit and outputs the compression result, and a comparison circuit which compares the compression result outputted from the compression circuit with a previously-calculated expectation value of the compression result of the access signal.

Abstract: A data processing apparatus is provided, which detects falsification of software to data and rewriting of the data. The data processing apparatus according to an embodiment of the present invention comprises a security unit which has an encryption circuit for decrypting an encrypted signal including secrecy data. The security unit includes a compression circuit which compresses an access signal used in accessing the security unit and outputs the compression result, and a comparison circuit which compares the compression result outputted from the compression circuit with a previously-calculated expectation value of the compression result of the access signal.

Abstract: A data processing apparatus is provided, which detects falsification of software to data and rewriting of the data. The data processing apparatus according to an embodiment of the present invention comprises a security unit which has an encryption circuit for decrypting an encrypted signal including secrecy data. The security unit includes a compression circuit which compresses an access signal used in accessing the security unit and outputs the compression result, and a comparison circuit which compares the compression result outputted from the compression circuit with a previously-calculated expectation value of the compression result of the access signal.

Abstract: A data processing apparatus is provided, which detects falsification of software to data and rewriting of the data. The data processing apparatus according to an embodiment of the present invention comprises a security unit which has an encryption circuit for decrypting an encrypted signal including secrecy data. The security unit includes a compression circuit which compresses an access signal used in accessing the security unit and outputs the compression result, and a comparison circuit which compares the compression result outputted from the compression circuit with a previously-calculated expectation value of the compression result of the access signal.

Abstract: After a selection key bundle is determined by a selection key bundle determining process, the following first authentication key authenticating process is executed. An authentication processing part selects a selection encryption key from selection key bundle following a predetermined association based on a received random-number data. On the other hand, another authentication processing part selects an encryption key from the selection key bundle as a selection encryption key, following the association based on the received random-number data, encrypts the random-number data using the selection encryption key so as to acquire encrypted random-number data and transmits to the former authentication processing part.