the web app I am currently working on generates a PDF file and sends to user who will use this PDF as a certificate.
My question is, how to make sure that this PDF file is impossible to be tampered by the user?
Thanks,
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the web app I am currently working on generates a PDF file and sends to user who will use this PDF as a certificate.
My question is, how to make sure that this PDF file is impossible to be tampered by the user?
Thanks,
You can’t stop someone altering the binary form of a file they hold since they can use a byte editor to change contents. You can however ensure that the PDF tampering is detected. Look at the Digital Signature facilities of PDF or consider doing a checksum/digest yourself on the PDF and keeping that with the PDF. At any time in future you can run the checksum algorithm again to see if it has been modified.