The method the GCHQ reportedly used was to tap directly into fiber optic cables passing through the UK to collect one image of a Yahoo user using their webcams every five minutes, as part of its Project Tempora, according to .
Thanks to this program, the GCHQ has reportedly been able to collect vast amounts of Internet data, without having to ask anyone for permission.
Nevertheless, Skype, in an online FAQ, says its encryption "protects you from potential eavesdropping by malicious users." In summary, there is no indication that most other webcam chats are vulnerable to the same kind of surveillance the GCHQ reportedly used against Yahoo users.
But if you're using your webcam through Yahoo, you may be vulnerable.
Skype Skype, for its part, has long touted the security of its software.