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...improvement of up to 125% on systems that were previously CPU bound. In fact, utilizing less than four cores we were able to achieve near line rate on a GigE LAN connection with 128, 192, and 256-bit AES. More details on the implementation can be found at http://www.internet2.edu/presentations/jt2008jan/20080122-rapier-bennett.htm starting at slide 30. Results can be found on slide 46. As the resulting cipher stream is indistinguishable from the original single-threaded implementation of AES-CTR there are no known issues with backward compatibility. This patch should be thought of as experime...