Bullrun (stylized BULLRUN) is a clandestine, highly classified decryption program run by the United States National Security Agency (NSA).[1][2] The British Government Communications Headquarters (GCHQ) has a similar program codenamed Edgehill. According to the BULLRUN classification guide published by The Guardian, the program uses multiple sources including computer network exploitation,[3] interdiction, industry relationships, collaboration with other intelligence community entities, and advanced mathematical techniques

Key size was reduced to 56 bits because IBM wanted to fit LUCIFER on a single chip. LUCIFER then became DES.

  Then..how to beat NSA as a superpower and become as powerfull as them?

 

parity check bit

https://www.mathworks.com/matlabcentral/newsreader/view_thread/93650