Hi All as mentioned today, the Credential Validation Service and its associated protocol defined by the OGSA-Authz group over a year ago, performs the same functionality as Rachana's Assertion Validation Service mentioned today in the CA-OPS meeting. The protocol doc and a description of the service can be found here http://forge.gridforum.org/sf/go/doc9011?nav=1 Regards David ***************************************************************** David W. Chadwick, BSc PhD Professor of Information Systems Security The Computing Laboratory, University of Kent, Canterbury, CT2 7NF Skype Name: davidwchadwick Tel: +44 1227 82 3221 Fax +44 1227 762 811 Mobile: +44 77 96 44 7184 Email: D.W.Chadwick@kent.ac.uk Home Page: http://www.cs.kent.ac.uk/people/staff/dwc8/index.html Research Web site: http://sec.cs.kent.ac.uk Entrust key validation string: MLJ9-DU5T-HV8J PGP Key ID is 0xBC238DE5 *****************************************************************