PDFlib PLOP DS 5.2

Several enhancements for digital signatures and certificate security including the following:

• Supports EMSA-PSS encoding scheme for RSA signatures. (EMSA-PSS = Encoding Method for Signatures Appendix, Probabilistic Signature Scheme).
• Supports OAEP for RSA certificate security. (OAEP = Optimal Asymmetric Encryption Padding).
• Reject input documents with certification signatures and permissions=nochanges unless the "sacrifice" option has been supplied to avoid breaking existing certification signature.
• No longer requires "conformance=extended" for NIST-15 elliptic curves other than P-256/P-384/P-521 since these are supposed to be supported in Acrobat.
• Increased the default value of "timestampsize" to accommodate changes implemented in the configuration of a commonly used TSA.