Nautilus secure phone is a program that allows two parties to hold a secure voice conversation. Released in May of 1995, it ran on ordinary phone lines using a pair of modems (one at each end). It was meant as an answer to NSA's attempts to force "key escrow" on encrypted communication. Later versions of the program could also use TCP, i.e. the Internet. After the original developers abandoned the project, it was taken over by German maintainers. Actual development focuses on porting to the ARM platform and portability.