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Signal downplays encryption key flaw, fixes it after X drama
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
Could not find much info about that claim, but context probably was that data is not possible to be accessed without compromising device, e.g., not possible to get info over network or by compromising some central location on remote server because there is none and all that data is stored locally.