Last November, Signal introduced a few changes to how it manages its safety numbers -- the unique code given to each conversation you have on the app. Safety numbers can change because someone gets a new phone and reinstalled the app or because the conversation has been compromised. Typically, whenever that code changed, those in the conversation had to manually approve the new safety number before sending or receiving any additional messages.
Source: Open Whisper Systems
Signal tests changes to how users verify secure contacts posted first on http://ift.tt/1tUdcCk
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