Security Tokens - Hardware Keys and OTP Devices

About 2 min read

A security token is a physical device or software used for authentication. Examples include hardware tokens that generate one-time passwords, USB-connected security keys (such as the YubiKey), and smartphone authenticator apps. It functions as the possession factor of multi-factor authentication added on top of a password, greatly strengthening account security.

Real-World Use Cases

"After we made FIDO2 security keys mandatory for accessing the cloud management console, administrator account compromises via phishing dropped to zero. The cost of introducing a YubiKey is a few thousand yen per unit, but the return on investment is extremely high."

Types of Security Tokens

Hardware tokens are physical devices, including a type that displays an OTP (one-time password) and FIDO2 security keys that connect via USB/NFC. Software tokens run as smartphone apps and generate TOTP. FIDO2 security keys are the most phishing-resistant authentication method; Google has reported that after rolling them out to all employees, phishing incidents dropped to zero. As of 2025, with the spread of passkeys, demand for FIDO2-compatible security keys is rising even further.security key books on Amazon offer detailed learning.

Deployment Scenarios and How to Choose

For personal use, a practical approach is to first introduce a TOTP app for your main accounts (email, bank, social media), and add a FIDO2 key for especially important accounts. In enterprise environments, more organizations are making hardware tokens mandatory for accessing VPNs and cloud services. To prepare for token loss, it is important to securely store backup recovery codes or register a spare security key in advance. Online banking also makes use of tokens for transaction authentication.

Putting Tokens to Use

By combining a strong random password with a security token, you achieve the highest level of account protection. Use our two-factor authentication setup guide as a reference and roll it out starting with your most important accounts. Because SMS authentication is vulnerable to SIM-swapping attacks, we recommend migrating to a TOTP app or hardware key wherever possible.account protection books (Amazon) are also a helpful reference.