NSA invents weak (Back Door present) crypto algo. Pushes RSA to make it a Default in a key function (RNG) by giving them $10 Million. NSA points to RSA as an early adopter and gets NIST to certify it. Millions of systems are now protected by an RSA product that the NSA deliberately weakened. Any sufficiently skilled rogue actor can attack virtually any business that uses these RSA products - NSA (Cyber security Comma…
The NSA doesn't "protect" anyone. They are an intelligence agency. Their mandate is to collect information. The group you're thinking of, the one that's actually supposed to "protect" the network, is US Cyber Command: http://en.wikipedia.org/wiki/United_States_Cyber_Command