one-time authentication
nounUK /ˌwʌn.taɪm ɔːˌθen.tɪˈkeɪ.ʃən/
US /ˌwʌn.taɪm ɑːˌθen.t̬ɪˈkeɪ.ʃən/
A one-time authentication is a special code you use just once to prove it is really you.
The app sent me a one-time authentication code by text before I could log in.
OTHER MEANINGS
2. A login method where a temporary code replaces a permanent password.
The bank uses one-time authentication so stolen passwords cannot be reused.
3. The process of confirming identity only for a single session or transaction.
One-time authentication kept the shared computer safe for each new user.
4. A security check that expires right after it is used.
After one-time authentication, the link stopped working.