The author has compiled a history of NSA backdoors and is asking for help in improving it. The history begins with the British Empire selling Enigma cipher machines to allied nations after World War II, knowing that the machines could be broken. The US and the UK then spied on those countries for almost 30 years. The history also includes the Boris Project, in which Crypto AG ciphers were weakened and backdoored for the NSA to listen to NATO communications. Other backdoors mentioned include the alteration of the Data Encryption Standard, the Clipper Chip, Lotus Notes, Actel ProASIC3 FPGA, Dual_EC_DRBG, and enabling encryption chips. The author also mentions a leaked report about the NSA intercepting and adding implants to computer equipment being sent through the mail.
https://www.ethanheilman.com/x/12/index.html