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At the height of the recent political unrest in Egypt, leaflets warned protesters not to use services like Facebook and Twitter to communicate, for fear of alerting the authorities about their intentions. Two security researchers have now created smart-phone apps that encrypt phone and text communications to offer a secure communication channel in such situations.
The apps use end-to-end encryption and a private proxy server to obfuscate who is communicating with whom, and to secure the contents of messages or phone conversations.
The two-way encryption is based on Zimmerman Realtime Transport Protocol, a proven way of exchanging cryptographic keys in order to establish a secure communication channel.