A comprehensive guide to virtual private networks. Volume II by International Business Machines Corporation

By International Business Machines Corporation

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The trusted third party could be a company key administrator located on company premises, or an external agency. This ensures that the keys remain in a company’s possession even after a system administrator or whoever used the keys leaves the company. Key recovery This technique was designed to allow law enforcement agencies (LEA) to recover the keys for decrypting secret messages of suspicious parties. Of course, you can also use this approach to recover your own keys yourself, but it is a rather complicated process and less practical than key escrow.

Please send us your comments about this or other redbooks in one of the following ways: • Fax the evaluation form found in “ITSO Redbook Evaluation” on page 621 to the fax number shown on the form. fm Part 1. Virtual Private Networks (VPN) Overview © Copyright IBM Corp. fm Chapter 1. Virtual Private Network (VPN) introduction This chapter provides an overview of the most important technologies employed to build VPNs today and emphasizes those used across the IBM product portfolio. The descriptions and explanations given in this chapter are based on the latest available standards for the discussed protocols and solutions and thus provide a valuable refresh and an update to existing VPN publications that are referenced as appropriate.

Where this point is reached needs to be determined per platform and cannot be generalized or measured in number of concurrent tunnels or amount of traffic over time. • VPN gateways will certainly absorb most of the encryption processing in almost any VPN scenario. Therefore, adding special encryption hardware or using dedicated VPN devices should be considered as an alternative before your firewall is breaking down or your router is no longer routing because it is bogged down by performing VPN operations.

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