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2. ITU-T recommendation X.509: The directory-public-key and attribute certificate frameworks, 2000.
3. Dueling theologies. In 1st Annual PKI Research Workshop, Gaithersburg, Maryland, USA, Apr. 2002.
4. IBM XML Security Suite. http://alphaworks.ibm.com/tech/xmlsecuritysuite/ , Apr. 2002.
5. C. Altenschmidt, J. Biskup, U. Flegel, and Y. Karabulut. Secure mediation: Requirements, design and architecture. Journal of Computer Security. To appear.