Digitally Signed PDF Files
A digitally signed PDF guarantees authenticity and integrity using Public Key Infrastructure (PKI). The signature is embedded in a specialized /Sig dictionary containing a cryptographic hash of the document bytes and the signer's X.509 certificate.
These files allow you to test your cryptographic validation logic. You can verify whether your system correctly identifies valid signatures, rejects expired certificates, and flags self-signed, untrusted roots.
Digitally signed
A document signed with a valid, standard digital signature to test baseline PKI validation.
Expired signature
A document signed with a certificate that has mathematically expired. Essential for testing time-based revocation logic.
Self signed
A document signed with an untrusted, self-generated certificate. Viewers should flag this as "Signature validity is unknown".
Frequently Asked Questions
Use Cases
- Validating compliance tools that require strict signature verification before archiving financial or legal documents.
- Testing UI logic that displays the "Signed and all signatures are valid" green checkmark in custom PDF viewers.
- Ensuring backend modification tools don't accidentally invalidate the cryptographic hash by altering the file bytes.