Each Sirkuni one-to-one chat has a unique safety number that allows you to verify the security of your messages and calls with specific contacts.
Verification of safety numbers is a good security practice for sensitive communication. If a safety number has been marked as verified, any change must be manually approved before sending a new message.
Sirkuni advises you whenever a safety number has changed. This allows users to check the privacy of their communication with a contact and helps protect against any attempted man-in-the-middle attacks.
The most common scenarios where a safety number advisory is displayed are when a contact switches to a new phone or re-installs Sirkuni, but these actions don't always result in a safety number change. However, if a safety number changes frequently or unexpectedly it may be a sign that something is wrong.
Undelivered messages will not be resent after a safety number has changed. Your messages with Sirkuni are end-to-end encrypted which is like having locks and keys for each message. When the safety number changes it's as if you have changed the locks and keys for your messages. So, messages that were sent before the safety number change are using the old locks and will not be delivered.
Note: This is only created after you've accepted a message request.
The easiest way to compare safety numbers is to scan your contact's QR code while viewing their safety number. You can also visually or audibly compare the numeric code, or use the share icon to copy it to your clipboard. If the safety number is identical then you can be sure that you are communicating with the right person.
View the safety number and tap the Mark as Verified or tap Clear Verification button.
A checkmark will appear in the chat header by your contact's name when the safety number is marked as verified. It will remain verified unless the safety number changes or you manually change the verification status.
