ISO 21324:2016旨在规定CCSDS数据链路的空间数据链路安全协议（以下简称安全协议）。该协议提供了一个安全标头和尾部以及相关程序，可与CCSDS遥测、遥控和先进轨道系统空间数据链路协议（参考文献[1]-[3]）一起使用，以提供在数据链路层应用数据认证和/或数据机密性的结构化方法。

The purpose of ISO 21324:2016 is to specify the Space Data Link Security Protocol (hereafter referred as the Security Protocol) for CCSDS data links. This protocol provides a security header and trailer along with associated procedures that may be used with the CCSDS Telemetry, Telecommand, and Advanced Orbiting Systems Space Data Link Protocols (references [1]-[3]) to provide a structured method for applying data authentication and/or data confidentiality at the Data Link Layer.