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Verification of printed PAdES signatures

While electronically signing a Document online, an encrypted copy of said document is stored online (thereby keeping confidentiality intact). The encryption is handled solely by the browser of the signer. A QR code containing a link to this online copy is embedded within the visual signature representation.
A printout of this document can now be checked electronically by scanning this QR code. The checking user is referred to the encrypted online copy, and subsequently decrypted in his browser with the key material contained within the QR code. Now the user can check the validity of the signature of the decrypted document and compare it to his printed copy.

Proof of concept web application
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