Summary:
A program that allows 2 parties to talk to each other using the PC's microphone & speakers over a direct TCP/IP connection with ridiculously high levels of encryption which is all done in the background automatically - no central server or key management hassle required. download it here (includes Delphi source).

Description
There are various programs available allowing VOIP (Voice Over IP) - this allows you to have a telephone-like conversation using the internet, by sending the sound from your PC's microphone to another person and playing it out using their PC speakers. However, many of them do not offer strong encryption, and even if they promise this, if the source code isn't available how do you know the vendor hasn't been persuaded by MI5 to put in a weakness allowing them to eavesdrop on your conversations? Crypto Speak allows you to set up an encrypted VOIP connecton and because all the source code is freely available you can be sure that there are no deliberate weaknesses or back doors.

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