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Skype Network Administrator’s Guide Skype 3.0 Beta 25

2006-10-31 Document version 2.0 Beta

Skype Security Evaluation

Skype.com contains resources for network administrators and more detailed information on

Skype security. Go to www.skype.com/security for specific security-related information

including Skype Security Bulletins, contact email addresses, and PGP keys for verifying

digital signatures.

This link also includes Skype security evaluation report by Tom Berson of Anagram

Laboratories. This report presents:

• An in-depth review of the security framework that is incorporated into Skype products

• A description of the protective mechanisms that are in use throughout the Skype

infrastructure

• The general security policy that defines the basis for all designs within Skype’s

operational framework

Skype Security FAQ

Increasingly, companies are leveraging the benefits of Skype to enhance customer support

activities by:

• Enabling customers to contact the company’s call center via the Skype client,

• Utilizing Skype’s Call Forwarding capability, and

• Forwarding calls to a PSTN number ending at your company’s call center switch.

While Skype was originally designed as a consumer application that offers a private

communication channel among Skype users, as enterprises incorporate Skype into their

mission-critical operations, certain questions about security of customer communications

naturally arise.

Here are some of these questions and their respective answers:

Is “Hole Punching” a Security Issue?

No. One of the difficulties that plagues many VoIP solutions is that the call is unable to

pass across network boundaries. This problem may arise due to the presence of network

address translation (NAT) equipment at the network’s boundary, or the result of restrictive

rules put in place on a firewall at the network edge.

To allow users the greatest possible flexibility, Skype has implemented a robust set of

NAT traversal techniques in its software, allowing Skype frequently to be able to operate

in situations where traditional VoIP telephony would fail.

It is common in most home and office networks today to use network address translation to

allow easier administration of the network without requiring each network to obtain its

own block of scarce network addresses.

An effective way to set up P2P communications between two computers hosted on private

networks—ones behind NAT devices—is to use a technique called “hole punching”. This

technique is widely used by application software communicating using UDP packets and

can also be used to establish connections using the more reliable TCP protocol.

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Skype - 3.0 beta Guía de usuario Pagina 25