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Appendix I Compaq/Intel Network Interface Controller Adapters
Compaq Personal Computers
Original - December 2000
I-4
I.2.3 IPSEC FUNCTION
The 82550 controller used on the Intel PRO/100 S Management Adapter includes an encryption
engine that provides on-the-fly encryption and/or authentication of transmit data without additional
use of system memory and software. This function, referred to as IP security (IPSEC), uses a
configurable algorithm and established Data Encryption Standards (DES) to provide high
performance (full transmission rate) encryption. Received IPSEC data frames are re-submitted to
the controller for processing and then returned to the driver.
Key features of IPSEC support include:
♦ Encryption capability of 56-bit DES to 168-bit 3DES
♦ Out-of-order processing of non-security transmit frames during security mode
♦ SHA-1 and MD-5 authentication with optional HMAC cryptographic hashing