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This is true. But I would suggest your operational security has bigger issues than this potential vulnerability if you are using WhatsApp.

Regardless - you still haven't given a source for you original claim. "not deserving benefit of the doubt" does not qualify. If the linked article is in fact you source then in the future please do not exaggerate such claims as you have done. I would have expected a claim from the article to read (along with a link to the source!):

> WhatsApp have modified the protocol slightly auspiciously for user experience but this allows a third party attacker to intercept messages sent offline only alerting the sender after they have been disclosed.