A time-based one-time password (TOTP) changes after a set period. code example

Example: totp key and token code implementation

1. Backend server creates a secret key for that particular user.2. Server then shares that secret key with the user’s phone application.3. Phone application initializes a counter.4. Phone application generate a one time password using that secret key and counter.5. Phone application changes the counter after a certain interval and regenerates the one time password making it dynamic.