Zfone in the Press
- Tech Nation**: Interview with Phil Zimmermann on PGP and the Zfone Project (1 Mar 09)
- Forbes: Encrypt Your Phone Calls (13 Jul 09 print edition)
How To Make Your Phone Untappable (18 Mar 08) - Linux Journal Online: Secure VOIP communication with ZRTP (YouTube video) (4 Dec 08)
- VoIP News: Pretty Good (VoIP) Privacy (9 Apr 07)
- San Jose Mercury News: An Interview with Phil Zimmermann on VoIP encryption (24 Feb 07)
- CyberSpeak Podcast - Two Former Federal Agents Talk About Computer Forensics, Network Security and Computer Crime: Phil Zimmermann interview about Zfone (18 Feb 07)
- VON Magazine (cover story): VON Pioneers: Philip Zimmermann Encrypts VoIP (Jan 07)
- IEEE Internet Computing: VoIP Security Gets More Visible (Nov-Dec 06)
- CNET News.com: E-mail security hero takes on VoIP (15 Aug 06)
- New York Times*: Voice Encryption May Draw U.S. Scrutiny (22 May 06)
- International Herald Tribune: Encryption tool rekindles security debate (21 May 06)
- Technology Review: Encryption Software May Halt Wire Tapping (2 Jun 06)
- Red Herring*: Zfone May Protect VoIP Calls (15 Mar 06)
- United Press International: PGP founder unveils new VoIP security (23 Mar 06)
- Wired News: A Pretty Good Way to Foil the NSA (3 Apr 06)
Privacy Guru Locks Down VOIP (26 Jul 05) - Voice of VOIPSA: A Tour Through Zfone (19 Jun 06)
- The Register: PGP creator offers VoIP crypto to Windows users (23 May 06)
- NewsForge: A first look at Zfone (13 Apr 06)
- Blue Box - The VoIP Security Podcast: Phil Zimmermann interview about Zfone (17 Mar 06)
- Associated Press: PGP Inventor to Encrypt Net Calls (28 Jul 05)
- eWeek: Privacy Pioneer Promises Secure VOIP (28 Jul 05)
- TechWorld: Encryption guru returns with VoIP software (27 Jul 05)
- CNET News: Encryption pioneer expands on VoIP plans (20 Jul 05)
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