Tue, Oct 4, 2022Introduction I came across the slides of a presentation by J. Donenfeld on Linux/OpenBSD Kernel Random Number Generators (RNG). In one of the slides, a weakness in the generator has been mentioned. The original design is based on the paper “Twisted GFSR Generators” by Matsumoto and Kurita. 92' paper describes an elegant way to make use of a generalized feedback shift register to generate a key stream. However, the implementation did not follow the paper’s assumptions that makes t...