By International Business Machines Corporation
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Additional info for A comprehensive guide to virtual private networks. Volume I
With this approach, any confidential information would be hidden from untrusted Internet users, with the firewall denying access to potential attackers. With the establishment of branch office connection VPNs, the company′ s corporate headquarters will be able to communicate securely and cost-effectively to its branches, whether located locally or far away. Through VPN technology, each branch can also extend the reach of its existing intranet to incorporate the other branch intranets, building an extended, enterprise-wide corporate network.
The algorithms often make use of initialization vectors (IVs) . These are variables independent of the keys and are good for setting up the initial state of the algorithms. A well-known block algorithm is DES, a worldwide standard cipher developed by IBM. DES is an acronym for Data Encryption Standard. DES operates on 64-bit blocks and has a key length of 56 bits, often expressed as a 64-bit number, with every eighth bit serving as parity bit. From this key 16 subkeys are derived, which are used in the 16 rounds of the algorithm.
A Short Introduction to Cryptography The purpose of this chapter is to introduce the terminology and give a brief overview of the major cryptographic concepts that relate to IPSec as a foundation of the virtual private networks. The pivot of any VPN technology is its cryptographic feature set. One should not plan and implement VPNs without knowing what level of security can be achieved with a given technology incorporated in a certain product. After all, you do not want to see your sensitive information at stake when crossing insecure channels.
A comprehensive guide to virtual private networks. Volume I by International Business Machines Corporation