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PC Security

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Windows XP Encrypting File System (EFS) for encrypting files ... Beginner's tutorial. Plausible Deniability Hidden Volume. CIT 380: Securing Computer Systems ... – PowerPoint PPT presentation

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Title: PC Security


1
CIT 380 Securing Computer Systems
  • PC Security

2
Encrypt Sensitive Files
  • Windows XP Encrypting File System (EFS) for
    encrypting files
  • GnuPG for encrypting files and email messages

3
Windows XP Encrypting File System (EFS)
  • EFS is not available with XP Home Edition
  • Reference Microsoft Windows XP Inside Out
    Chapter 14
  • Right Click in Windows Explorer on the folder
  • Choose Properties General Tab Advanced Button
    Encrypt contents to secure data

4
Windows XP Encrypting File System (EFS)
  • File names are green in Window Explorer

5
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6
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7
truecrypt
  • Encase, computer forensic tool, can break EFS
  • Free open source - http//www.truecrypt.org/
  • http//www.truecrypt.org/docs/
  • Beginners tutorial
  • Plausible Deniability Hidden Volume

8
GnuPG
  • GnuPG is an open-source encryption tool for
    Windows and Linux
  • Complete and free replacement for PGP
    (www.gnupg.org)
  • http//wolfram.org/writing/howto/gpg.html
  • (CD gpg.html)
  • Install Windows Privacy Tray (WinPT)

9
Enigmail
  • Install Thunderbird mail client from
    www.mozilla.org
  • Download Enigmail extension from www.mozilla.org
  • Add a menu item to encrypt and decrypt email
    using GnuPG

10
Backup your system regularly
  • Hard Disk Quality and Reliability,
    http//www.pcguide.com/ref/hdd/perf/qual/index.htm
    (see quotes from the article)
  • While the technology that hard disks use is very
    advanced, and reliability today is much better
    than it has ever been before, the nature of hard
    drives is that every one will, some day, fail.

11
Backup your system regularly
  • full recovery usually starts at a few hundred
    dollars and proceeds from there.

12
Ntbackup utility
  • Find ntbackup.exe
  • Start Programs Accessories System Tools Or
  • C\dell\Tech Tools\System Tools\ Backup Or
  • Run C\WINDOWS\system32\ntbackup.exe
  • Run the Backup/Restore Wizard
  • Choose a place to save your backup
  • C\temp\Backup
  • Creates a file Backup.bkf

13
Create Backup CD
  • Run your CD creator
  • Make a data CD
  • Add Backup.bkf to the CD

14
Simple Quick Backup
  • Copy My Documents folder to a CD or USB

15
Safe use of public PCs
  • Kinko's Case Highlights Internet Risks
  • (CD Kinko.htm)
  • For more than a year, unbeknownst to people who
    used Internet terminals at Kinko's stores in New
    York, Juju Jiang was recording what they typed,
    paying particular attention to their passwords.
    Jiang had secretly installed, in at least 14
    Kinko's stores, software that logs individual
    keystrokes. He captured more than 450 user names
    and passwords, using them to access and even open
    bank accounts online.

16
Keyloggers
  • Capture keystrokes
  • Can steal passwords and credit card numbers
  • Can email or ftp the file containing the
    keystrokes
  • Keyghost (http//www.keyghost.com )
  • Keyloggers are difficult to detect
  • Look at an ordinary system process

17
Public PCs
  • Kinkos
  • Cyber cafes
  • Public Libraries
  • Hotels

18
Using Public PCs
  • Avoid using important accounts (bank, etc.)
  • Remove web browser data
  • Cache, history, cookies, form data.
  • Remove temporary files
  • Start Search All files and folders when it
    was modified? today
  • Empty recycle bin

19
References
  • Matt Bishop, Introduction to Computer Security,
    Addison-Wesley, 2005.
  • Thomas C. Greene, Computer Security for the Home
    and Small Office, Apress
  • Andrew Conry-Murray Vincent Weafer, The
    Symantec Guide to Home Internet Security, Addison
    Wesley
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