Simple Definition for Beginners:
Offline authentication is a way to verify your identity and access services without needing an internet connection.
Common Use Example: When you use a smart card to access a building or an ATM to withdraw cash, you are using offline authentication.
Technical Definition for Professionals:
Offline authentication is a method of identity verification that operates without requiring an active internet connection. This process relies on locally stored credentials or tokens to authenticate users. It is commonly used in environments where internet access is unreliable or unavailable. Key aspects include:
· Local Credential Storage:
o Credentials, such as passwords, PINs, biometric data, or cryptographic keys, are stored locally on the user’s device or an authentication token (e.g., smart cards, USB tokens).
· Authentication Process:
o The user provides their credentials to the local authentication system.
o The system compares the provided credentials against the locally stored data to verify the user’s identity.
o If the credentials match, access is granted without requiring an internet connection.
· Security Considerations:
o Offline authentication systems must ensure the secure storage of credentials to prevent unauthorized access.
o Encryption and secure hardware elements (e.g., Trusted Platform Module – TPM) are often used to protect stored credentials.
o Periodic synchronization with an online system may be necessary to update credentials or revoke access.
· Use Cases:
o Access Control Systems: Physical access to secure areas using smart cards or biometric scanners.
o ATMs: Withdrawals and transactions using bank cards and PINs without internet connectivity.
o Mobile Apps: Offline access to services where credentials are verified locally on the device.
Offline Authentication