Open WhatsApp
Open the chat with the contact
Tap the contact name
Tap Encryption
Tap Security Code
Tap Scan Code or Compare Code
Verify the new code with your contact
If needed, reinstall WhatsApp or change devices to generate a new security code
Open WhatsApp
Open the chat with the contact
Tap the contact name
Tap Encryption
Tap Security Code
Tap Scan Code or Compare Code
Verify the new code with your contact
If needed, reinstall WhatsApp or change devices to generate a new security code