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Origin of the ITU-T Recommendation X.805
ITU-T Recommendation X.805 Security architecture for systems providing end-to-end communications had been developed by ITU-T SG 17 (ITU-T Lead Study Group on Telecommunication Security) and was published in October 2003.
The group has developed a set of the well-recognized Recommendations on security. Among them are X.800 Series of Recommendations on security and X.509 - Public-key and Attribute Certificate Frameworks.

PPT Version