Secure Remote Access
Virtual Private Networks (VPNs) have been developed to allow the use of a public network, such as the Internet, for secure communication. There are essentially, two types of VPN;
In order to overcome the proprietary nature of early VPN's the IEEE came up with the IPSec standard to enable interoperability of VPN gateways. This standard has emerged to be the main commercial standard. The IPSec standard normally uses the Triple DES algorithm for encryption. However more recently a new standard has emerged - AES, which is a more efficient algorithm. Any VPN requires quite heavy processing power to encrypt and decrypt data.
Using IPSec requires the remote client to have software loaded locally, which encrypts and decrypts all data at the client. The gateway device does the encryption and decryption at the remote site. The deployment of IPSec client software to all remote users has created management issues. In 2003 we have seen the development of "clientless" VPN's for remote users, based upon the Secure Socket Layer encryption used to secure web pages. These are ideal for some simple, quick, secure remote user access.
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