|By Christopher Frenz||
|March 7, 2008 11:00 AM EST||
While numerous security resources can be found explaining the proper security measures an individual should take on any computer they administer, few resources exist that describe security measures an individual can take to protect themselves when they are forced by circumstance to use a potentially unsecure machine for which they have no administrative control, such as a traveler who wants to check his email at an Internet café or someone choosing to access the Web from a public terminal at a library. While in many instances it can be hard enough for typical computer users to protect themselves against the proliferating world of spyware, Trojans, rootkits, and botnet software installs, it can be even harder to protect oneself from threats hidden in a machine that you do not control. When a would-be user of a public terminal sits down and begins to use the machine, what assurances do she really have that there is not software installed that is tracking her computer usage, logging keystrokes, or performing other such nefarious deeds? The truth is that, practically speaking, there is little that can be done to verify the security and privacy of information that passes through the operating system (OS) or any of the installed applications of a public terminal. What then is the answer to this dilemma, for users who must make use of computing devices that are open to the public?
The answer is to actually use your own operating system install complete with its own applications. This can be easily accomplished by using a LiveCD, which is a CD (or DVD or USB flash drive) that is executable upon boot and contains a computer operating system, typically Linux. Files that would typically install onto the hard drive of the computer are loaded into system RAM and as such simply rebooting the computer will return it to its previous state. These traits make the use of a LiveCD a great idea for anyone needing to use a public computer terminal. Loading an operating system from the CD will allow a user to take advantage of the computers resources, including network access and access to disk drives, but will not load the OS or any applications that are installed on the computer’s hard drive. This means that any key loggers or other such tracking software that is installed upon the machine will not be loaded and the user of the terminal need not fear software being used to monitor his/her actions. While this will not protect against hardware-based key loggers or network-based monitoring such as packet sniffing, it does help to dramatically improve security and privacy, by all but eliminating software-based threats. Moreover, the fact that the LiveCD install and use data resides only on either the CD or in volatile memory such as system RAM is an added benefit. As soon as the CD is removed and the computer is rebooted, all of the information pertaining to the usage of the machine is wiped out, thereby making it virtually impossible for a future user to garner any usage information from browser histories, caches, or auto-complete features.
Moreover, Linux based LiveCDs come in a great variety with one of the first Linux LiveCDs to appear being Knoppix. Many Linux LiveCDs like Knoppix and the Fedora and Ubuntu Live distributions load versions of Linux that closely resemble desktop installs of Linux, and provide access to robust desktop environments such as KDE or Gnome and applications such as OpenOffice.org. While these types of LiveCD distributions are great if you need all of the features of a full Linux desktop, their performance can be somewhat lacking since data often needs to be read from the CD to load certain applications. Users who are simply interested in a LiveCD distribution for purposes of accessing the Web and email may instead want to consider distributions such as Puppy Linux and Damn Small Linux, as these distributions can be completely loaded into system RAM. While not as application rich as other Linux distributions, most users will find them surprisingly feature complete given their small size, and as a result of running solely off of system RAM, they will yield extremely rapid response times.
Before you head out the door to make a trip to the airport or even the local coffee shop, remember to grab not only your keys, but also a copy of a Linux Live CD.
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