Microsoft, Yahoo, and Google expressed unease Friday about the National Security Agency’s ability to bypass online security systems that protect the privacy of internet users. …

http://rt.com/usa/encryption-compromised-yahoo-google-microsoft-530/

_NSAKEY was a variable name discovered in Windows NT 4Service Pack 5 (which had been released unstripped of its symbolic debugging data) in August 1999 by Andrew D. Fernandes of Cryptonym Corporation. That variable contained a 1024-bit public key. …

http://en.wikipedia.org/wiki/NSAKEY

Any network service protected by a public key can be accessed by whoever has the corresponding secret key.