| 摘要 |
A data conversion unit includes a first input/output unit, a second input/output unit, an encoder, a decoder, a random number generator for generating random number data, and a control unit which selects a first, second and third setting function. The first setting function sets the data conversion unit to input data from the first input/output unit, encode data by the encoder, and output the encoded data from the second input/output unit. The second setting function sets the data conversion unit to input data from the first input/output unit, replace the data with the random number data generated by the random number generator, and output the random number data from the second input/output unit. The third setting function sets the data conversion unit to input encoded data from the second input/output unit, decode the encoded data by the decoder, and output the decoded data from the first input/output unit.
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