A scientist at Cryptonym corporation has discoverd that Microsoft has inserted a back door for the NSA into Windows NT 4.0. For a program to install encryption services under Windows NT, ordinarily it must be signed by Microsoft. However, the NSA back door will allow NSA-signed encryption providers to register themselves as well. Either they’re doing this so that the NSA doesn’t have to share their own encryption code with Microsoft for signing before deploying it, or they’re doing this so that the NSA can install encryption service providers with back doors on other computers for espionage purposes.