  Application of CHSH game in Linear Cryptanalysis is presented. Till date, the
known usage of CHSH game in Quantum Cryptology is to verify the device
independence of the protocols. We observed that the classical symmetric ciphers
having the bias equal to 0:25 can be improved to 0:35 exploiting the game which
indicates clear improvement over existing Linear and Differential
cryptanalysis. In the present initiative, we showed the application of the game
in linear cryptanalysis on a lightweight cipher named SIMON. However, the
approach can be extended to Differential cryptanalysis too. This observation
opens a new direction of research in quantum cryptography.
