  T-310 is a cipher that was used for encryption of governmental communications
in East Germany during the final years of the Cold War. Due to its complexity
and the encryption process,there was no published attack for a period of more
than 40 years until 2018 by Nicolas T. Courtois et al. in [10]. In this thesis
we study the so called 'long term keys' that were used in the cipher, in order
to expose weaknesses which will assist the design of various attacks on T-310.
