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IPSec Overview Part One: General IPSec Standards

  • Article is provided courtesy of Cisco Press.
  • Date: Feb 22, 2002.

Contents

  1. IP Security Protocol
  2. DES Algorithm
  3. Triple DES Algorithm (3DES)
  4. Diffie-Hellman (D-H)
  5. Message Digest 5 (MD5)
  6. Secure Hash Algorithm 1 (SHA-1)
  7. Rivest, Shamir, and Adelman Signatures (RSA)
  8. Internet Key Exchange (IKE)
  9. Certificate Authorities (CA)

Article Description

Virtual Private Networks (VPNs) are becoming required expertise for network and security engineers, and IPSec is the most commonly used protocol when implementing VPNs. In this first article of a five-part series on the Cisco implementation of IPSec, Andrew Mason delves into the components that make up the IPSec protocol suite.

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Triple DES Algorithm (3DES)

Triple DES (or 3DES) is also a supported encryption protocol for use in IPSec on Cisco products. The 3DES algorithm is a variant of the 56-bit DES. 3DES operates similarly to DES in that data is broken into 64-bit blocks. 3DES then processes each block three times, each time with an independent 56-bit key. 3DES effectively doubles encryption strength over 56-bit DES.

4. Diffie-Hellman (D-H) | Next Section Previous Section

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