Data conversion device, data conversion method, and program

A data conversion method executed in a data conversion device, the method comprising steps of:

• performing a data stirring process on input data by a stirring processing section;
• and
• performing a data compression process on input data by a compression processing section, the input data including data segments which are divisions of message data, the message data being a target of data conversion,
• wherein the compression processing section is configured of multi-stage compression subsections which receive all of the data segments in the message data,
• part of the multi-stage compression subsections is configured to perform the data compression process based on both of output of the stirring processing section and the data segments in the message data,
• part of the multi-stage compression subsections is configured to perform the data compression process based on both of output of a previous-stage compression subsection and the data segments in the message data, and
• a compression subsection located in the final stage of the multi-stage compression subsections is configured to output a hash value of the message data.

A program including a recorded sequence which allows a data conversion device to execute a data conversion process, the sequence comprising steps of performing a data stirring process on input data by a stirring processing section;

• and
• performing a data compression process on input data by a compression processing section, the input data including data segments which are divisions of message data, the message data being a target of data conversion,
• wherein the compression processing section is configured of multi-stage compression subsections which receive all of the data segments in the message data,
• part of the multi-stage compression subsections is configured to perform the data compression process based on both of output of the stirring processing section and the data segments in the message data,
• part of the multi-stage compression subsections is configured to perform the data compression process based on both of output of a previous-stage compression subsection and the data segments in the message data, and
• a compression subsection located in the final stage of the multi-stage compression subsections is configured to output a hash value of the message data.