Security token definition
A physical peripheral required to access a system, usually as part of multi-factor authentication (MFA). Tokens greatly increase system security since it’s very hard for hackers to remotely obtain physical objects not connected to online networks.
Types of security tokens
- Connected tokens physically link to the system, like USB keys or smartcards.
- Disconnected tokens need no physical contact with the system but require user input — for example, authentication apps on your smartphone.
- Contactless tokens need no physical contact or user input and include Bluetooth or NFC tokens.