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Zfone is a cross-platform encryption software for secure VoIP calls.
Zfone uses the ZRTP protocol to negotiate the cryptographic keys and consists of the Zfone libZRTP SDK and the Zfone application.
The application detects when a call starts, initiates a cryptographic key agreement between two parties and then continues to encrypt and decrypt voice packets during communication.
Zfone libZRTP SDK is available for developers to integrate into their VoIP applications.
Unix: C, iptables, IP Queue, GTK Interface
MacOS: C, Cocoa, IPFW, Divert Sockets
Windows: C, Intermedia NDIS driver, Win API