Requires Free Membership to View

VoIP security
Get more VoIP security best practices with our Voice over IP security learning guide

Zfone offers a VoIP security and encryption solution in an industry that has thus far been slow to offer one. Working with any standard SIP, Zfone offers encryption services for callers and callees running the software. The fact that Zfone's creator is Phil Zimmermann, the creator of email security application PGP is reason enough for VARs and systems integrators to look into this technology in their campaign to sell VoIP to their customers.


Secure VoIP with Zfone

What makes Zfone special? Basically, it delivers public key encryption without requiring support from a public key infrastructure (PKI). Those already familiar with PGP will grasp the nuances involved, but it suffices to say that Zfone uses what Zimmermann calls "ephemeral Diffie-Hellman with hash commitment" and uses a set of keys only for the duration of a single call, so that subsequent replay attacks are impossible.

Although enterprises and large organizations may often be loath to adopt client-based solutions such as this, Zimmermann's long and compelling security track record is such that even these kinds of users should be willing to put Zfone to the test.

Learn more about securing VoIP with Zfone.

About the author
Ed Tittel is a regular contributor to numerous TechTarget Web sites. He is the author of more than 140 books on a wide range of computing subjects, from markup languages to information security. He is also Technology Editor for
Certification Magazine, and he manages content for Email Ed at

This was first published in April 2007

There are Comments. Add yours.

TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.