The W3C: Organization and Technologies

XML compliant syntax for representing signatures.
Procedures for computing and verifying signatures.
Provides integrity, message authentication, and/or signer authentication of information.
Status:
- Canonical XML 1.0: Recommendation (for logically comparing XML documents).
- XML-Signature Syntax and Processing in Candidate Recommendation.
For more information: XML Signature Working Group home page
http://www.w3.org/Signature/

XML Signature