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IPSec provides a high level of security by using cryptography-based mechanisms. Cryptography allows information to be transmitted securely by hashing (integrity) and encrypting (confidentiality) the information.

A combination of an algorithm and a key is used to secure information:

  • The algorithm is the mathematical process by which the information is secured.

  • A key is the secret code or number required to read, modify, or verify secured data.

Windows 2000 IPSec supports the following services.