A single USB security key can neutralize the threat of stolen passwords. Even if a hacker obtains your login credentials, a physical key like YubiKey, Google Titan, or Nitrokey acts as an impenetrable second gate, requiring a tap to verify identity.
Unlike SMS codes or authentication apps, these devices are immune to interception and phishing. If you accidentally log in on a fake website, the key generates a wrong response, locking the attacker out. Experts recommend buying a second key as a backup in case of loss or breakage.
Niche vulnerability remains physical theft of the key alongside the password. However, for protecting crypto exchange accounts, email, and social media, this is a small investment against a catastrophic loss.