Network Security in Software

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Network Security
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8 The Encryption Details dialog box appears (as shown in the following illustration) Notice that the user who can decrypt the le by default is the person who has encrypted the le (at the top) You may add additional users to the list by clicking the Add button so that they can decrypt the le as well
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9 Make a note of who the recovery agent is: ____________________________ 10 To view the certi cate details for the person who can decrypt the le (gclarke in my example), click the Add button 11 Click View Certi cate 12 Notice at the bottom that there is a valid date for the certi cate of this user record the date in the space provided: _________________ to _________________ 13 Click the Detail page tab to view the certi cate details 14 Click OK ve times
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Securing Communication
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Internet protocol security (IPSec) is a fairly new security protocol that can be used to encrypt all IP traf c as well as take part in authentication services and ensure data integrity of information sent across an IP network One of the things that is so exciting about IPSec is that if you enable IPSec, by means of an IPSec policy, you will not need to con gure different encryption methods for each type of application you run on the computer all IP traf c is encrypted by IPSec once the IPSec policy is implemented For example, because IPSec encrypts all traf c you do not need to con gure a separate encryption technology for your web server, FTP server, and telnet server They all run on top of TCP/IP, so IPSec can be used to secure traf c presented by each application Exercise 11-6 demonstrates how to con gure an IPSec policy on your web server and a web client When you enable IPSec you can use one of the default IPSec policies built-in The IPSec policy is used to determine the type of traf c to be encrypted and the method to be used to encrypt the traf c The three default IPSec policies are as follows:
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Client (respond only): If asked to communicate securely, this system will respond by using IPSec, but will never request or initiate secure communication Server (request security): When enabled, this system will request to use IPSec to secure traf c; if the remote system does not support IPSec, the system will communicate insecurely Secure server (require security): This system will communicate with a remote system only if the remote system supports and uses IPSec
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EXERCISE 11-6
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Con guring IPSec to Secure Network Traf c
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In this lab you will enable IPSec between the Windows XP client and Windows 2000 Server so that hackers can t capture network traf c and view the data submitted between the XP client and the server 1 Before enabling IPSec you may want to verify that you can capture data submitted into the web site of the Windows 2000 Server from the Windows XP client
11:
Network Security
2 On the server, start capturing network traf c with Network Monitor 3 Go to the Windows XP client and type the address of the server in a web browser to access the web site In Windows XP, type a credit card number into the site and then click Submit 4 Go to the 2000 Server and stop capturing the network traf c; view the packet capture to determine whether you can see the credit card number submitted (as shown in the following illustration)
5 The goal of this exercise is that after IPSec has been enabled, you would not be able to view credit card information typed into the site Also note that the
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