A digital signature can be used to authenticate the identity of a user and the document’s content. It stores information about the signer and the state of the document when it was signed. Any subsequent changes to a signed PDF file invalidate the signature.
The AFP2PDF Plus Transform requires a digital certificate in the PKCS#12 format. PKCS stands for Public Key Cryptography Standard, originally developed by RSA Security, Inc. PKCS#12 defines a file format used to store private keys with accompanying public key certificates, protected with a password-based symmetric key.
The AFP2PDF Plus Transform makes use of a digital certificate through the use of one
of these options in the
Certificate requires both the name of the PKCS#12 file and its password to read the PKCS#12 file.
Certificate2 requires the name of the PKCS#12 file, but lets you point to a file that contains the needed password.
Once the file has been signed, the validity can be checked by opening the file with Adobe Acrobat.