http://christopher.wojno.com/articles/category/questions en-us 40 Exploration through Code <p>I wrote a paper for my Operating Systems class this recent semester about covert channels.</p> <h1>Abstract</h1> <p>A thirty year-old problem, covert channels continue to plague the security of modern operating systems. These channels are explained and discussion of the subject is motivated. A short evolution of the problem is given as well as several classifications of covert channels. Several methods such as type enumeration, flow analysis, virtualization, and adding noise are discussed and analyzed. Finally, one system is evaluated in context of those methods and future directions into covert channel research are suggested.</p> <p><a href="/files/defining_and_confining_covert_channels_in_operating_systems.pdf">Read more</a></p> Sun, 30 Dec 2007 12:07:00 -0800 urn:uuid:ffb6ccc6-5f57-4b47-bbf0-5f160a027c40 Christopher Wojno http://christopher.wojno.com/articles/2007/12/30/covert-channel-paper Theory Questions security covert channels operating system paper <p>I harm but one, until I&#8217;m told. I cure all ills, until I&#8217;m known. Not always am I known when I&#8217;m told; not always am I told when I&#8217;m known. My masters become my slaves until truth behold. <span style="display:none;" id="riddle_number_1_hint"><ins>Small in stature, white in color, but never seen with the eye.</ins></span> What am I?</p> <p><a href="#" onclick="javascript: $('riddle_number_1_hint').toggle();">View</a> the lost line for a hint.</p> <p>Copyright&#169; 2007 Christopher R. Wojno so don&#8217;t try to cheat by looking up the answer online (yet). All rights reserved. You need written permission to use this for anything not covered by fair use.</p> Wed, 29 Aug 2007 13:34:00 -0700 urn:uuid:a2d2f56d-7005-4c61-92da-c70c40b416d6 Christopher Wojno http://christopher.wojno.com/articles/2007/08/29/riddle-number-1 Life Questions riddle master slave known told cure harm <p>Ever notice: In <em>every</em> car commercial, all paved roads are recently well watered?</p> Wed, 22 Aug 2007 19:27:00 -0700 urn:uuid:adb44396-40ad-4c32-acb6-0cb06ef3cda4 Christopher Wojno http://christopher.wojno.com/articles/2007/08/22/wet-and-wild-car-commercials Questions car commercial water road