Signal allows you to manually verify the numbers that you are communicating with. Each Signal one-to-one chat has a unique safety number that allows you to verify the security of your messages and calls with specific contacts. Here is how to use the safety number on the signal.
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By verifying contact, you verify that the public key you are encrypting the messages to, is in fact the same as the keys used by the other party in the conversation – If not verified, you could be encrypting your keys with a Man in The Middle’s keys, which then proceeds to decrypt the messages, read them, and re-encrypt them with the recipients key.
How to verify safety numbers with your contact on signal
- Open a chat with a contact. Tap on the chat header or chat settings more and Select View Safety Number.
- Open the QR
- scan your contact’s QR code while viewing their safety number.
- You can also compare the safety numbers with your trusted contact.
- If you received a 60-digit code, copy it to your clipboard, then go to the Safety Number page and long-press on the 60-digit code and select “Compare with Clipboard.”
- If the safety number is identical then you can be sure that you are communicating with the right person.
- A checkmark will appear in the chat header by your contact’s name when the safety number is marked as verified.
If you have noticed a frequent change in safety numbers or if someone changes their signal account it will say something like “Your safety number with [contact] has changed.” it’s best to re-verify them before continuing the conversation.