the.com/two factor
proof you are you, using something you know plus something you probably left in an uber.
means a login system requiring two separate proofs of identity, usually a password plus a code from your phone.
from grew out of 1980s bank security thinking, where a card plus a pin beat a pin alone, then moved online as passwords proved embarrassingly easy to steal.
sms weaknesssim swapping can hijack your text codes
authenticator appsgenerate codes offline, safer than sms
adoption jumpbreach headlines doubled 2fa signups fast
physical keysyubikeys resist phishing better than codes