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A comment on University of California tells students not to use WeChat, WhatsApp in China. Parent comment

Re:University of California tells students not to use WeChat... by bpye on Sunday January 13, 2019 @07:01PM (#18899536)
You can concievably MITM WhatsApp too, at least if your target isn't that observant. The only indication that your connection has been rekeyed is a message in your chat which could be easily missed.
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Re:University of California tells students not to use WeChat... by hxsvui on Sunday January 13, 2019 @07:14PM (#18899598)
Is there any PoC, or end-to-end description supporting your claim that this is possible?

I'm quite sure WhatsApp uses transport security, too. You can't just MitM then.

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