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Signal tests changes to how users verify secure contacts

The tweaks are based on feedback it received on an earlier update.
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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.

With the November update, Open Whisper Systems (OWS) introduced an "advisory mode" setting that allowed users to be notified of a safety number change but not be prevented from exchanging messages. After testing out that setting and collecting feedback from users, OWS has made some adjustments to it, which are now available for testing in the beta channels of the Signal app.

In advisory mode, if you receive a message in a conversation with a new safety number, a notification will appear telling you about the new number. And it will stay on the screen until you see it. Even if you get a few new messages, they won't push the notification off of the screen. When sending a message after a safety number change, the same notification will appear and you'll be able to send messages as long as you've had the chance to see the notification. If it happens to appear just after you send a message or just before, the message won't be delivered until you approve it. Users can also now mark a safety number as "verified" and any safety number changes from a verified conversation will require manual approval even if you've switched on the advisory mode.

The changes are available in beta now and OWS encourages users to send along any feedback they have.

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