Due to the recent discussion about the asm-optimized version of AES which is included in loop-AES, I'd like to point out that I've ported this implementation - Dr. Brian Gladman's btw. - to CryptoAPI a long time ago. http://therapy.endorphin.org/patches/aes-i586-asm-2.5.58.diff The demand for this patch will rise quickly if cryptoloop is included :) Regards, Clemens