What is PDF Digital Signature?
A cryptographic signature embedded in a PDF that proves who signed it and that the file has not been altered since.
PDF digital signatures use public-key cryptography (PKCS#7) to bind a signer's identity to the file's hash. Trusted signatures rely on a Certificate Authority chain. They differ from 'electronic signatures' (a typed name or drawn squiggle), which prove intent but not cryptographic integrity.
Also known as
- PDF e-signature
- digitally signed PDF
Related terms
- PDF Encryption — Cryptographic protection that requires a password to open or modify a PDF — typically AES-128 or AES-256.
Category: Security