SPI - Security Parameters Index

The SPI (Security Parameters Index) is a pointer that references the session key and algorithms used to protect the data being transported. The index is defined during the SA (Security Association) establishment and described in the ESP (Encapsulating Security Protocol) or AH (Authentication Header) extension to the IP header.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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