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• Should computer exams be transmitted as PDF files or Word files?

Should computer exams be transmitted as PDF files or Word files?

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Michael S. Mimoso, Editorial Director

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Let's think about how you would compromise either file type. Unless there is password protection and an encrypted file, anyone with access to the server where the files are stored (data at rest, not data in motion – since you are using SSL to protect the communications pipe) could edit the file and change the data. That person could even mess with the metadata in either PDF or a Word file, which would leave no trace of the edits.

As mentioned above, the only real difference in the process you described is that the students need to actually hand-write the answers on the PDF, which inherently adds a level of verification to the authenticity of the information. But if the students were to print out the Word file and hand-write it, and then scan it back in, the processes are roughly the same.

Ultimately, I think some measure of encryption and digital signature would be required whenever a file is submitted in order to feel good about the security of the documents and the integrity of the tests.

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This was first published in January 2008

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