HP-UX IPSec Version A.03.02.02 Administrator's Guide HP-UX 11i version 2 and HP-UX 11i version 3 (762800-001, April 2014)

Security
Parameters Index
(SPI)
A numerical index used with the source IP address to identify a Security Association (SA) on the
receiving system. Each SPI and source IP address pair must be unique on the receiving system.
SHA1 (Secure Hash Algorithm-1). Authentication algorithm that generates a 160-bit message digest
using a 160-bit key. IPsec truncates the message digest to 96 bits.
SHA2 (Secure Hash Algorithm-2) Authentication algorithm that generates 256-bit, 384-bit, and 512-bit
message digest.
SPI See Security Parameters Index..
transform A transform defines the IPsec action(s) to be taken on the IP data, such as passing the data in
clear text, discarding the data, authenticating and encrypting the data using ESP, or authenticating
the data using AH.
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