Tags: lcg marsaglia prng 

Rating: 4.5

A sever shows us random looking numbers and we have to predict the output of the next number. The numbers were generated using a linear congruential generator. Using the Marsaglia method we were ale to fully recover the parameters of the PRNG and thus predict the number sequence.

Original writeup (http://duksctf.github.io/AlexCTF2017-bringweakness/).