name: CSB-ID
full_form: Crypto Session Bundle Identifier
context: The security mechanism described in this clause extends that defined in clause 5.2.2 to provide end-point key diversity. The mechanism is identical to that described in clause 5.2.2, except for the distribution of K-ID. Contrary to clause 5.2.2, the key is distributed with an end-point-specific key identity (UK-ID) (e.g. a GUK-ID) derived from the key id (K-ID). This allows the receiving entity of the key distribution to diversify the shared key for end-point-specific use. Specific types of key require use of end-point key diversity. The type of key is defined by the 'purpose tag' within the key identifier stored in the CSB-ID field of the MIKEY payload. Hence on receipt of a key, the contents of the CSB-ID field instruct the receiving entity whether end-point diversity should be applied to the key. The key, K, is distributed encrypted specifically to the receiving entity and signed by the initiating entity as described in clause 5.2.2. The key is distributed with a 32-bit
description: The Crypto Session Bundle Identifier (CSB-ID) is a parameter used in the MIKEY payload to identify the type of key and instruct the receiving entity whether end-point diversity should be applied to the key.
explanation: The context explicitly mentions that the CSB-ID field contains information about the type of key, which justifies its classification as a Parameter. It is a critical network attribute for secure communication.
section_title: 5.2.3	Key distribution with end-point diversity
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