What does "Your security code with the contact has changed" in WhatsApp mean?

What does "Your security code with the contact has changed" in WhatsApp mean - briefly?

The message "Your security code with the contact has changed" in WhatsApp indicates that the encryption keys used to secure your conversation with that contact have been updated. This can happen if either you or the contact changes your phone number or device.

What does "Your security code with the contact has changed" in WhatsApp mean - in detail?

When you see the message "Your security code with the contact has changed" on WhatsApp, it indicates that the encryption key used to secure your messages with this particular contact has been updated or replaced. This typically happens when one or both parties involved in the conversation change their phone number or device, reinstall WhatsApp, or perform a factory reset on their devices.

WhatsApp uses end-to-end encryption to protect your communications from being intercepted by third parties. Each time you start a new conversation with someone, WhatsApp generates a unique security code that only you and the recipient can see. This code is used to encrypt and decrypt messages, ensuring that only the intended recipients can read them.

When the message "Your security code with the contact has changed" appears, it means that this encryption key has been updated for some reason. WhatsApp automatically handles this process in the background to maintain the integrity and security of your communications. However, you may be prompted to verify the new security code to ensure that both parties are aware of any changes in their encryption keys.

To verify the new security code, follow these steps:

  1. Open WhatsApp and go to the conversation with the contact whose security code has changed.
  2. Tap on the contact's name at the top of the screen to open their profile.
  3. You will see a message indicating that the security code has changed.
  4. Compare the new security code with the old one (if you have it noted down). If they do not match, tap "Notify" to inform WhatsApp about the change.
  5. WhatsApp may ask for additional verification steps, such as a voice or video call, to confirm your identity and ensure that both parties are aware of the change in security codes.
  6. Once verified, you can continue using WhatsApp securely with the updated encryption key.