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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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DES Algorithm

DES is used to encrypt and decrypt packet data; it turns cleartext into ciphertext via an encryption algorithm. The decryption algorithm on the remote end restores cleartext from ciphertext. Shared secret keys enable the encryption and decryption. DES uses a 56-bit key, ensuring high-performance encryption.

3. Triple DES Algorithm (3DES) | Next Section Previous Section

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