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Trailrunner7 writes 'Bruce Schenier writes on Threatpost.com: In computer security, a lot of effort is spent on the authentication problem. Whether it is passwords, secure tokens, secret questions, image mnemonics, or something else, engineers are continually coming up with more complicated — and hopefully more secure — ways for you to prove you are who you say you are over the Internet. This is important stuff, as anyone with an online bank account or remote corporate network knows. But a lot less thought and work have gone into the other end of the problem: how do you tell the system on the other end of the line that you are no longer there? How do you un-authenticate yourself?My home computer requires me to log out or turn my computer off when I want to un-authenticate. This works for me because I know enough to do it, but lots of people just leave their computer on and running when they walk away. As a result, many office computers are left logged in when people go to l

Computer scientists at Sandia National Laboratories in Livermore, Calif., have for the first time successfully demonstrated the ability to run more than a million Linux kernels as virtual machines.

NEW YORK (AP) -- Xerox Corp. has agreed to buy Affiliated Computer Services Inc. for about $5.75 billion in cash and stock in a deal that will boost the size of its document management business and take it another step away from its roots as a printer company....