2006-03-20 Apache Santuario Library implementing XML Digital Signature Specification & XML Encryption Specification Java C XML Security for Java 2016-12-05 2.0.8 XML Security for C++ 2015-03-15 1.7.3 XML-Signature Syntax and Processing W3C XML Signature XML-Signature Syntax and Processing IETF 3275 Canonical XML W3C Canonical XML Exclusive XML Canonicalization W3C Exclusive XML Canonicalization XML Encryption Syntax and Processing W3C Exclusive XML Encryption