scope:

This series of Recommendations / International Standards defines a set of generic facilities to assist in the provision of security services in OSI applications. These include:

(a) a set of notational tools to support the specification of selective field protection requirements in an abstract syntax specification, and to support the specification of security exchange s and security transformations;

(b) a service definition, protocol specification and PICS proforma for an application-service-element (ASE) to support the provision of security services within the Application Layer of OSI;

(c) a specification and PICS proforma for a security transfer syntax, associated with Presentation Layer support for security services in the Application Layer.

This Recommendation / International Standard defines the prot ecting transfer syntax, associated with Presentation Layer support for security services in the Application Layer.