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To answer the question: We don't know for sure. As far as I know there hasn't been a recent independent security audit of the software. Secondly, Tox will exists anyway, but its community seems to be pretty annoyed of problems going on behind the scenes. And also, I personally do not consider your choice as very secure, as it is closed-source (or prove move wrong?) EFF published a list of nearly all IM tools and listed up their security and privacy, so I would like there for a new instant messenger that suits my needs.