BS ISO 21324:2016 pdf download

BS ISO 21324:2016 pdf download.Space data and information transfer systems — Space data link security protocol
1.2 SCOPE
This Recommended Standard defines the Security Protocol in terms of:
a) the protocol data units employed by the service provider; and
b) the procedures performed by the service provider.
It does not specify:
a) individual implementations or products;
b) the implementation of service interfaces within real systems;
c) the methods or technologies required to perform the procedures; or
d) the management activities required to configure and control the service.
This Recommended Standard does not mandate the use of any particular cryptographic algorithm with the Security Protocol. Reference [4] provides a listing of algorithms recommended by CCSDS; any organization should conduct a risk assessment before choosing to substitute other algorithms. Annex E (non-normative) defines baseline implementations suitable for a large range of space missions.
1.3 APPLICABILITY
This Recommended Standard applies to the creation of Agency standards and for secure data communications over space links between CCSDS Agencies in cross-support situations. The Recommended Standard includes comprehensive specification of the service for inter- Agency cross support. It is neither a specification of, nor a design for, real systems that may be implemented for existing or future missions. The Recommended Standard specified in this document is to be invoked through the normal standards programs of each CCSDS Agency, and is applicable to those missions for which interoperability and cross support based on capabilities described in this Recommended Standard is anticipated. Where mandatory capabilities are clearly indicated in sections of the Recommended Standard, they must be implemented when this document is used as a basis for interoperability and cross support. Where options are allowed or implied, implementation of these options is subject to specific bilateral cross support agreements between the Agencies involved.
1.4 RATIONALE
The goals of this Recommended Standard are to:
a) provide a standard method of applying security at the Data Link Layer, independent of the underlying cryptographic algorithms employed by any particular space mission;
b) preserve compatibility with existing CCSDS Space Data Link Protocol Transfer Frame Header and Trailer formats and frame processing implementations so that, where appropriate, legacy frame processing infrastructure may continue to be used without modification;
c) preserve compatibility with the CCSDS Space Link Extension (SLE) forward and return services; and
d) facilitate the development of common commercial implementations to improve interoperability across agencies.
More discussion of the Security Protocol’s goals and design choices, including its interaction with other CCSDS services, may be found in reference [D3].