Skype

Introduction

Skype is an application that allows users to make voice calls over the internet. Calls to other Skype users are free, calls to real phones can be made for a fee.

Click here to try Skype free

Features

Voice and video calls to other Skype systems, landlines and cell phones.

RSA is used to negotiate keys which are used to encrypt channels. There are security and privacy concerns that were raised at the Black Hat Europe conference.

The directory of users is decentralized and distributed amongst users to scale the system well

Requirements

Supports Windows 200, XP, Vista and Max OS X and Linux.