Timing attacks against user logon and network I/O
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United States of America Patent
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Jan 5, 2010
Grant Date -
Feb 24, 2005
app pub date -
Sep 8, 2004
filing date -
May 3, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
In a first aspect of the invention, method for classifying characters within a character string entered via a keyboard device includes logging interrupts, checking a time between interrupts, checking an interrupt duration and classifying the characters within the character string based upon the time between interrupts and the interrupt duration. In a second aspect of the invention, a method for protecting against timing attacks against a trusted path mechanism includes employing a multithreaded process with a first thread to prevent any timing Trojan horses from running, running the first thread in a loop at a first priority and preventing unprivileged processes from obtaining a priority higher than the first priority.
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