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You may be thinking that SSL and TLS sound great, but also sound complex to use In fact, both are easy to use, either across the Internet or internally in a LAN
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To implement secure Internet and intranet transmissions, you need a web server that supports SSL or TLS, such as Microsoft IIS 7, plus a supporting web browser, such as Microsoft Internet Explorer 7, both of which are included in Windows Server 2008 From the browser, to visit a web site that has implemented SSL or TSL, you simply need to begin the URL with https:// rather than http:// (see 9 on IIS for details on how to implement secure web sites) SSL will then kick in, and without your even being aware that it s happening, the browser and server decide which encryption algorithm to use to transfer a private key, and then use that key and the chosen private key encryption scheme to encrypt and decrypt all the rest of the data during that session
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Once you are connected using SSL, your browser will indicate that a secure connection is established IE7 displays a padlock icon to the right of the address bar NOTE Even though the combination of public and private encryption is relatively fast, it is still significantly slower than no encryption For that reason, it is recommended that you use SSL only when you send sensitive information, such as financial or credit card data, and not for an entire web site
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Although SSL can be used within a LAN and in an intranet, it requires a security server (which function IIS fulfills) and can get in the way of applications that are working across a LAN The answer to this is Internet Protocol Security (IPSec), which works between any two computers over a network to supply encrypted transmission of information without a security server and without getting in the way of applications IPSec is a part of IP and works at the third (Network) layer, below any applications, and therefore seldom interferes with them (see the discussion of networking layers in The OSI Model in 5) The IPSec Process IPSec is almost totally automated, and once group policies are established for its operation, network users don t realize that their network communication is taking place securely The process for establishing and carrying out IPSec is as follows: 1 Domain or local computer policies are established that specify what network traffic needs to be secure and how that security will be handled 2 Based on the policies, IPSec establishes a set of filters to determine which network packets require secure transmission 3 When IPSec receives from a sending application a series of network packets that require secure transmission, the sending computer passes this fact to the receiving computer The two computers exchange credentials and authenticate each other according to IPSec policies 4 Given authentication, the two computers work out an algorithm whereby each computer can generate the same private key without having to transmit the key over the network, again according to IPSec policies 5 The sending computer uses the private key to encrypt the packets it is transmitting, digitally signs them so that the receiving computer knows who is sending the packets, and then transmits the packets 6 The receiving computer authenticates the digital signature and then uses the key to decrypt the packets and send them on to the receiving application Set Up IPSec To set up and use IPSec, you need to only establish or revise default IPSec policies You can do that through the IP Security snap-in to the MMC with these steps: 1 Click Start | Run, type mmc, and press enter The MMC shell opens 2 Click the File menu, click Add/Remove Snap-in, scroll down, and double-click IP Security Policy Management
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