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Table Of Contents  CertiGuide to Security+
 9  Chapter 2:  Communication Security (Domain 2.0; 20%)
      9  2.1  Remote Access
           9  2.1.7  IPSEC

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IPSec Transport and Tunnel Modes
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IPSec versus DoS Attacks
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IPSec and Encryption

Specific encryption technologies used by IPSec include:

  • Diffie-Hellman key exchange between peers on a public network (this is discussed in more detail in chapter 4)

  • Public key cryptography for signing the Diffie-Hellman exchanges to guard against identity-spoofing and man-in-the-middle attacks

  • Standard algorithms such as DES for data encryption

  • Keyed (HMAC161) and non-keyed (MD5, SHA) hashing for packet authentication

  • Signed digital certificates used to provide proof of identity162

IPSec and Diffie-Hellman

IPSec uses Diffie-Hellman key exchange to communicate key data without requiring the actual keys to travel across the network, and public key cryptography to sign the key exchange transaction packets, to ensure their integrity and origin.



 __________________

161. http://www.ietf.org/rfc/rfc2104.txt

162. “White Paper – IPSec Executive Summary”, Cisco Systems, http://www.cisco.com/warp/public/cc/so/neso/sqso/eqso/IPSec_wp.htm

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IPSec Transport and Tunnel Modes
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IPSec versus DoS Attacks
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