There should also be a “Signer Info” section, where you can display our certificate.
whether it’s been modified since the time of signing.You can view the digital signature’s properties with most PDF readers, which should display the validity summary, containing: Specifically, we use a certificate issued to us, Smallpdf AG, by a Trust Service Provider, Global Sign, to put a digital signature on your document. When you sign a document using our tool, we provide a Simple Electronic Signature that includes a Long Term Validation- (LTV-) enabled timestamp. For Smallpdf users, this is when Smallpdf processes the file online. The timestamp records the exact time when a user places the signature on the document. The Embedded Timestamp of Digital Signaturesīesides our digital signature, we also add a timestamp that’s signed and can’t be forged. The document is then sealed again following the addition of every new signature. Additional signees can add their digital signatures and additional information on top of the existing signatures without tampering with and invalidating them. This means that all the information that was added by the signee, including the signature itself, becomes read-only and uneditable. Whenever a digital signature is added to the document it’s sealed with this unique number that is attached to that particular signature.
The number that is calculated for the document can be verified with many PDF readers or software. A digital signature is a cryptographic process where a large unique number is calculated based on the document’s contents and the attached certificate, which contains the name of the signee.
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