Technology - IP Techniques 4 - IPsec Security

Synopsis

IP Security (IPsec) is IPv4’s and IPv6’s built-in cryptographic system, for authentication and encryption of each packet’s contents. We discuss IPsec’s header structure, tunnelling to create Virtual Private Networks (VPNs), key-pair generation, hash algorithms, Cyclic Redundancy Checking (CRC) and modes of operation, including AH (Authentication Only), ESP (Encapsulating Security Header) and Tunnel Mode.

Table of Contents

  • 1. Synopsis
  • 2. Introduction
  • 3. IPsec and other standards
    • 3.1 Contrast with SSL/TLS
    • 3.2 Contrast with PGP or GPG
    • 3.3 IPsec in Layer 3
    • 3.4 3rd generation RFC standards
  • 4. Symmetrical cryptography
    • 4.1 64 and 128 bit keys
  • 5. Public Key cryptography
    • 5.1 Generating the key pair
    • 5.2 Generating and sending the symmetrical key
      • 5.2.1 Internet Key Exchange Protocol (IKE)
      • 5.2.2 IKE authentication mechanisms
      • 5.2.3 IP Compression
  • 6. Hash algorithms and integrity checking
    • 6.1 Checksums and Cyclic Redundancy Checking (CRC)
    • 6.2 Cryptographic hashing
  • 7. IPsec’s modes of operation
    • 7.1 VPN tunnel applications
    • 7.2 SSL/TLS and NAT firewall compatibility
    • 7.3 AH and ESP
      • 7.3.1 AH Header
      • 7.3.2 ESP Header
    • 7.4 Transport Mode
    • 7.5 Tunnel Mode
      • 7.5.1 ESP in Tunnel Mode
  • 8. Weaknesses of IPsec
    • 8.1 Schneier’s and Ferguson’s critique
    • 8.2 IKEv1’s Aggressive Mode compromised
  • 9. Related reports

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Licence Information

Focus Report Profile

Technologies

Internet
Telecoms Infrastructure

Number of pages 13

Status Archived

Last updated 18 Dec 2007
Update History

Analyst: Robin Whittle

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