| Zfone | |
|---|---|
| Original author | Phil Zimmermann |
| Type | Encrypted VoIP |
| License | Proprietary[1] |
| Website | zfoneproject |
Zfone is software forsecure voice communication over the Internet (VoIP), using theZRTP protocol. It is created byPhil Zimmermann, the creator of thePGP encryption software. Zfone works on top of existingSIP- andRTP-programs, but should work with any SIP- and RTP-compliant VoIP-program.
Zfone turns many existing VoIP clients into secure phones. It runs in the Internet Protocol stack on any Windows XP, Mac OS X, or Linux PC, and intercepts and filters all the VoIP packets as they go in and out of the machine, and secures the call on the fly. A variety of different software VoIP clients can be used to make a VoIP call. The Zfone software detects when the call starts, and initiates a cryptographic key agreement between the two parties, and then proceeds to encrypt and decrypt the voice packets on the fly. It has its own separateGUI, telling the user if the call is secure. Zfone describes itself to end-users as a "bump on the wire" between the VoIP client and the Internet, which acts upon the protocol stack.
Zfone's libZRTP SDK libraries are released under either theAffero General Public License (AGPL) or a commercial license. Note that only the libZRTP SDK libraries are provided under the AGPL. The parts of Zfone that are not part of the libZRTP SDK libraries are not licensed under the AGPL or any other open source license. Although the source code of those components is published for peer review, they remain proprietary. The Zfone proprietary license also contains atime bomb provision.
It appears that Zfone development has stagnated, however, as the most recent version was released on 22 Mar 2009.[2] In addition, since 29 Jan 2011, it has not been possible to download Zfone from the developer's website since the download server has gone offline.[3]
| Email clients | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Secure communication |
| ||||||||||||||
| Disk encryption (Comparison) | |||||||||||||||
| Anonymity | |||||||||||||||
| File systems(List) | |||||||||||||||
| Security-focused operating system | |||||||||||||||
| Service providers | |||||||||||||||
| Educational | |||||||||||||||
| Anti–computer forensics | |||||||||||||||
| Related topics | |||||||||||||||
