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For me the biggest thing is - how do we have any idea that WhatsApp is actually using this wonderful crypto tech under the hood? For example my WhatsApp is claiming my messages to my friend are encrypted, whereas his phone is claiming they are not. This is not exactly conducive to trust!

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Mine did that for a while, then it resolved itself. Maybe it takes some time for all instances in a group to agree they are encrypted; I also think at least one of my groups marked itself encrypted after everyone in it had posted at least one comment since yesterday.

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