Steganography: Tinkering with Skype can allow people to send undetectable messages

Skype is extremely popular. The service, owned by Microsoft, boasts more than 600m registered users. By one estimate it accounts for more than a third of international phone calls. One reason for its popularity is that, because it avoids ordinary telephone networks, it is cheap. A subsection of its users, though, prefer it for its security — for every conversation is encrypted and therefore, in theory, difficult to eavesdrop upon.Yet hackers, security researchers and other professional paranoids have often wondered how secure Skype really is. Its users are warned in the program’s terms of service — and its developers have reiterated — that data may be passed to the authorities, where it is “legally required and technically feasible”. And because the program itself is “closed source”, meaning no one outside Skype knows precisely how it works, it is impossible to know what “technically feasible” actually means, or whether the software contains any compromising bugs.
www.economist.com/news/science-and-technology/21571120-tinkering-skype-can-allow-people-send-undetectable-messages-speaking

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