Microsoft has drastically overhauled the network running its Skype voice-over-IP service, replacing peer-to-peer client machines with thousands of Linux boxes that have been hardened against the most common types of hack attacks, a security researcher said.
The change, which Immunity Security’s Kostya Kortchinsky said occurred about two months ago, represents a major departure from the design that has powered Skype for the past decade. Since its introduction in 2003, the network has consisted of “supernodes” made up of regular users who had sufficient bandwidth, processing power, and other system requirements to qualify. These supernodes then transferred data with other supernodes in a peer-to-peer fashion. At any given time, there were typically a little more than 48,000 clients that operated this way.