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BTX encryption

hh86
Virus Writing Bulletin [1]
January 2011

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Abstract

This instruction test in bit base: the bit specified by offset. Carry flag is set according to test, if bit was 0 then CF = 0 else CF = 1. The bit is then set to 1. This means that we can use BTS to set every bit individually from each virus value. You can use it to set random bit to complete a bit string:

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