Data processing device and method for processing secret data

A data processing device comprising:

• a memory configured to represent each data word of a plurality of data words in the form of at least two respective shares;
• a logic circuit;
• an input circuit configured to, depending on a control sequence specifying a sequence of real operations and dummy operations,
• provide the at least two shares of one of the data words as input shares to the logic circuit if the control sequence specifies a current operation as a real operation and
• provide at least two shares of a specific value as the input shares to the logic circuit if the control sequence specifies the current operation as a dummy operation;
• wherein the logic circuit is configured to receive the input shares from the input circuit and to process the input shares to generate at least two processing result shares according to a predetermined logic function;
• and
• an output circuit configured to
• output the at least two processing result shares if the control sequence specifies the current operation as a real operation and
• refresh the at least two shares of the one of the data words with the processing result shares and output the refreshed at least two shares of the one of the data words if the control sequence specifies the current operation as a dummy operation.