How to check a signed PDF, ADOC or ASiC-E

What to check

In a signed document the presence of a signature is not the point. What has to be checked is the certificate, the signature type, the timestamp, the integrity of the document, and whether the structure of the container is intact.

Tvarka checks uploaded documents automatically and shows the signing state. For an independent public check, the validator on the ePaslaugos government portal can be used as well.

• Who signed, as named in the certificate.
• Who issued the certificate, and whether it was valid at the moment of signing.
• The signature level, and whether it is qualified.
• The time of signing, backed by a timestamp rather than by a date typed into the document.
• Whether the content has changed since the signature was applied.

When it matters most

Check the signature before filing a document with an authority, before paying under a contract, before relying on a certificate you have received, or when a document arrives from an unusual source.

If a document was extracted from its container and then modified, the original signature may no longer hold.