How can you check that a document has been signed has not been modified subsequently?

A PDF reader (such as Adobe Acrobat Reader) can verify the validity of an electronic signature. When the document is opened, the PDF reader automatically performs two operations:

  • It calculates the document’s fingerprint to see if it matches the fingerprint of the document that was signed;
  • It checks the digital certificate to ensure its validity (therefore the authentication of the signatories).

If the reader recognizes one of these elements as invalid, a message will warn the user that the electronic signature is invalid. Thus, there is no need to initial the document on each page: The electronic signature technology also plays this role.


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Closd – 15-day free trial!

Closd – 15-day free trial!

Amid the ongoing Covid-19 epidemic, Closd continues to support businesses to help sustain economic activity. To help them organise and prepare themselves rapidly in the face of the crisis, Closd is offering its services free of charge to any new client for 15 days.

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