name: SPI
full_form: Security Parameter Index
context: length shall be set to 0 as no additional session data is required. Session Data (variable length): contains session data for the crypto session. Since length is 0 for the Prot Type TLS, this field is omitted. SPI Length (8 bits): the length of SPI (in bytes). For the Prot Type TLS, the length can be set arbtrarily. SPI (variable length): the SPI corresponding to the session key to be used for the crypto session. The SPI identifies a specific TGK/GTGK that is used to derive the TEK for the crypto session (the SPI could also identify a TEK directly). Editorâs note: Setting #P=0 in both the init and response message is not allowed according to RFC 6043. There are two possible ways to get around this problem. Either we ignore the restriction in RFC 6043 (which really doesn't matter) or we specify a dummy Security Policy for TLS which does not contain any values. Editorâs note: The Prot Type TLS must be registered with IANA and the value is therefore TBD.
description: The Security Parameter Index (SPI) is a parameter used to identify a specific session key or Traffic Encryption Key (TEK) in a crypto session, particularly in the context of Transport Layer Security (TLS) protocol.
explanation: The SPI is classified as a Parameter because it is an attribute that defines a critical aspect of the network operation - specifically, identifying the session key or TEK for encryption. The context highlights its role in TLS sessions and its variable length, which further solidifies its classification as a parameter.
section_title: H.1	The TLS Prot Type
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