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A document that regulates security-relevant aspects of an intended connection between an agency and an external system. It regulates the security interface between any two systems operating under two different distinct authorities. It includes a variety of descriptive, technical, procedural, and planning information. It is usually preceded by a formal MOA/MOU that defines high- level roles and responsibilities in management of a cross-domain connection.
A document specifying information security requirements for system interconnections, including the security requirements expected for the impact level of the information being exchanged for all participating systems.
NIST SP 800-47 Rev. 1 under interconnection security agreement
In this guide, an agreement established between the organizations that own and operate connected IT systems to document the technical requirements of the interconnection. The ISA also supports a Memorandum of Understanding or Agreement (MOU/A) between the organizations.
NIST SP 800-47 [Superseded] under Interconnection Security Agreement (ISA)