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Validation and Semantics of XML Digital Signatures

Validation and Semantics of XML Digital Signatures. Paul A. Lambert April 15, 1999 plambert@sprintmail.com. Overview. Meaning Validation processing Key Usage Delegation Recommendations. What is the meaning of a Signature?. I approve? I created? I read? I grant?

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Validation and Semantics of XML Digital Signatures

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  1. Validation and Semantics of XML Digital Signatures Paul A. LambertApril 15, 1999 plambert@sprintmail.com

  2. Overview Meaning Validation processing Key Usage Delegation Recommendations

  3. What is the meaning of a Signature? • I approve? I created? I read? I grant? • Signature “meaning” is not part of the signed document! • XML signatures must carry signature meaning separate from signed information

  4. Validation • Determine algorithms, signature formats, and key • Hash appropriate data • Use appropriate algorithms and key to create signature over hashed information • Compare computed signature to attached signature • Determine if the key was trusted for this usage • is the key valid? • Is it appropriate for this XML application?

  5. Key Usage • Validation: • cryptographic • key usage • is the key valid? • is the key appropriate fo this application? • Usage must be tied to XML schema • Embed XML in X.509? • Create XML protery authorization certificates!

  6. Delegation and Authorization • XML statements can delegate trust to determine key usage • Trust management • Assignment of rights to make statements in specific ranges. • Grant rights for ranges of target and range of signature semantic property values

  7. Signatures versus Authorization • Signatures are statements of the form:“In {schema}, {key_holder} says {object}has {property}”. • Authorization statements are of the form:“In {schema}, {key_holder-1} grants {key_holder-2}the rights to make statements in {object_range}{property_range}”.

  8. Recommendations • XML signatures should include signature semantics • perhaps all XML signatures are a type of RDF statement • XML signature specification must include complete description of validity processing • Authorization should be supported • perhaps a specifc type of RDF statement to grant property ranges to subject ranges

  9. Contact Information Paul A. Lambert Certicom Corp. 25801 Industrial Blvd. Hayward, CA, 96565 +1-510-780-5400 plambert@sprintmail.com

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