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Tutorial # 4. Information Security 493. 6.1: Encrypt a Windows File. Windows operating systems since Windows 2000 have included the ability to encrypt files. Follow these steps: Within Windows Explorer or the Desktop, right-click an individual file and choose Properties.
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Tutorial # 4 Information Security 493
6.1: Encrypt a Windows File • Windows operating systems since Windows 2000 have included the ability to encrypt files. Follow these steps: • Within Windows Explorer or the Desktop, right-click an individual file and choose Properties. • On the General tab, click the advanced button that appears underneath Attributes.
Conti… • Check the Encrypt box contents to secure data. Notice that you cannot choose to both encrypt the data and compress it. • Click OK to exit. Click OK again at the Properties dialog box. • A warning box appears asking if you want to encrypt only the file or the entire directory (the parent folder). Choose to only encrypt the one file and click OK again. • What is different about the file appearance now?
6.2: Turn On Folder Encryption with cipher • Folders can be encrypted from the command line in Windows XP using the cipher command. • Earlier versions of cipher allowed you to work with individual files as well as folders. Starting with Windows XP, cipher now works at the folder level only.
Conti… • To use cipher to turn on folder encryption, follow these steps: • Choose Start Run. • Type cmd and press Enter. This action opens a command window. • make sure you are on the C, and your prompt shows “C:\>”. • Open ‘My computer’, clicks on C, and create a new folder there. Create a new file test1.txt. • Go back to the cmd, Type cipher /e directory, where directory is replaced by the name of a directory/folder you have created. Press Enter.
Conti… • A message appears that the directory is now encrypted. • To see the status of the directory, type cd folder (where folder is the name of the folder you created), then type cipher directory. • A message appears stating that all new files added to this directory will be encrypted.
Conti… • Create a file within that directory (creating a file is easily accomplished by typing echo hello > test2.txt, which creates a text file with only the word hello in it). • within that directory, type cipher. In the list of files that appears, you’ll see a U to the left of all files that were initially there and an E to the left of the newly created file, which indicates that it is encrypted. • Type exit to close the command window.
6.3: WireShark • WireShark purpose is to capture network traffic and to represent it in a readable form. • This exercise will help to get you familiar with wireshark and to understand how to read the packets, to do so, follow the next steps:
Conti… • Double click on WireShark file provided to you. • Scroll through the top window, click on one of the lines, and try to understand the explanation in the middle window.
Conti… • Write click on any packet, and chose ‘follow TCP stream’, • that window will show the interaction between the PCs in regard to this stream. • In the filter tap, write down ‘dns’, and click enter. What will this do?
Tutorial Delivered By : Ashraf Youssef IS dept., College of Computer and Information Sciences (CCIS), King Saud University , Riyadh , Kingdom of Saudi Arabia. Mobile:0507181787 E-mail : ashraf@ksu.edu.sa
