Original creating apparatus and originality guaranteeing apparatus

An originality guaranteeing apparatus, comprising:

• a receiving unit receiving a file obtained by adding date and time data and a checksum to a result of combining document data and signature data;
• a verifying unit verifying the file, and extracting the checksum from the file;
• a comparing unit making a comparison between the checksum extracted by said verifying unit and the checksum recorded to the file;
• a signature unit performing a signature process for the file if the checksums match as a result of the comparison, and generating a new checksum;
• and
• a file creating unit creating a new file by combining the new checksum with data of the file.

An original creating method, comprising:

• combining document data and signature data;
• adding date and time data to a result of a combination, and generating a checksum;
• creating a file by adding the date and time data and the checksum to the result of the combination;
• and
• transmitting the file to an originality guaranteeing apparatus.

An originality guaranteeing method, comprising:

• receiving a file obtained by adding date and time data and a checksum to a result of combining document data and signature data;
• verifying the file, and extracting the checksum from the file;
• making a comparison between the extracted checksum and the checksum added to the file;
• performing a signature process for the file if the checksums match as a result of the comparison, and generating a new checksum;
• and
• creating a new file by combining the new checksum with data of the file.

An originality guaranteeing method, comprising:

• combining document data and signature data;
• adding date and time data to a result of a combination, and generating a checksum;
• creating a file by adding the date and time data and the checksum to the result of the combination;
• transmitting the file to an originality guaranteeing apparatus;
• receiving the file obtained by adding the date and time data and the checksum to the result of combining the document data and the signature data;
• verifying the file, and extracting the checksum from the file;
• making a comparison between the extracted checksum and the checksum added to the file;
• performing a signature process for the file if the checksums match as a result of the comparison, and generating a new checksum;
• and
• generating a new file by combining the new checksum with data of the file.

An original creating program, which is controllable by a controlling device, (for causing a computer to execute a process,) comprising:

• combining document data and signature data;
• adding date and time data to a result of a combination, and generating a checksum;
• creating a file by adding the date and time data and the checksum to the result of the combination;
• and
• transmitting the file to an originality guaranteeing apparatus.

A program, which is controllable by a controlling device, (for causing a computer to execute a process,) comprising:

• receiving a file obtained by adding date and time data and a checksum to a result of combining document data and signature data;
• verifying the file, and extracting the checksum from the file;
• making a comparison between the extracted checksum and the checksum recorded to the file;
• performing a signature process for the file if the checksums match as a result of the comparison, and generating a new checksum;
• and
• creating a new file by combining the new checksum with data of the file.

An originality guaranteeing system, comprising:

• a combining unit combining document data and signature data;
• a first signature unit adding date and time data to a result of a combination, and generating a checksum;
• a first file creating unit creating a file by adding the date and time data and the checksum to the result of the combination;
• a transmitting unit transmitting the file to an originality guaranteeing apparatus;
• a verifying unit extracting the checksum from the transmitted file;
• a comparing unit making a comparison between the checksum extracted by said verifying unit and the checksum added to the file;
• a second signature unit performing a signature process for the file if the checksums match as a result of the comparison, and generating a new checksum;
• and
• a second file creating unit creating a new file by combining the new checksum with data of the file.