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This sample demonstrates how to digitally sign the PDF document with the PFX certificate file. It is possible to digitally sign with X509 certificates such as .pfx files with private keys and support for Hardware Security Module (HSM), Online Certificate Status Protocol (OCSP), Certificate Revocation List (CRL), and Windows Certificate Store to offer authenticity and integrity.
DEMO
SOURCE
Click the button to view a PDF document generated by Essential PDF. Please note that Adobe Reader or its equivalent is required to view the resultant document.

Signature Settings
Cryptographic Standard: CMS CAdES

Digest Algorithm: SHA1 SHA256 SHA384 SHA512 RIPEMD160

Sign new PDF document
Standard Type: Standard Author


Sign existing PDF document
Source

Certificate

Password
Reason
Contact
Location
It is also possible to digitally sign with timestamp. More information about the digital signature and timestamp can be found in this documentation section.