Front-End Token Authorization to Cut Authentication Overhead
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Solution Overview
Problem
Existing front-end devices incur significant network overhead, power, and processing costs due to certificate-based authentication, and are vulnerable to attacks when certificates are compromised.
Innovation Solution
Implementing a token-based authorization system where a token client receives and manages tokens derived from a secret, using a proxy device to secure communication and periodically rotate tokens, thereby reducing network overhead and processing costs while enhancing security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If certificate-based authentication is used for front-end devices, then security is provided, but network overhead, power consumption, and processing costs increase significantly
Solution Approach 1:
The authentication system is segmented into multiple components: front-end devices, token clients, token servers, and backend systems. The computationally intensive certificate verification is separated from front-end devices and moved to token servers, while front-end devices only need to present tokens. This segmentation reduces power consumption at front-end devices while maintaining security through distributed authentication processing.
Solution Approach 2:
Token clients and token servers act as intermediaries between front-end devices and backend systems. Instead of front-end devices directly performing certificate-based authentication with backends, tokens are issued by token servers and presented to backends through this intermediary layer. This eliminates the need for front-end devices to handle complex cryptographic operations, reducing their power consumption while maintaining security through the intermediary authentication layer.
2Reliability
If certificate-based authentication is used for front-end devices, then security is provided, but network overhead and processing costs increase significantly
Solution Approach 1:
The authentication processing complexity is segmented and relocated from front-end devices to token servers. Front-end devices only need to store and present tokens, while token servers handle the computationally intensive tasks of token generation, validation, and management. This segmentation dramatically reduces device complexity at front-end devices while maintaining security through centralized token management.
Solution Approach 2:
Instead of requiring front-end devices to store and process full certificates, the system uses token copies that represent authenticated identities. Tokens are simplified representations that front-end devices can easily store and present, while the full cryptographic verification is performed by token servers that hold the original certificate authorities. This copying approach reduces processing complexity at front-end devices while maintaining security through centralized verification.
3Reliability
If tokens are periodically rotated in the token-based system, then security is improved, but additional processing and communication operations are required
Solution Approach 1:
The system implements periodic token rotation where tokens are automatically renewed at scheduled intervals. Token clients monitor expiration dates and proactively request new tokens before old ones expire. This periodic action maintains continuous security without interruption to service, as token rotations occur in the background without affecting front-end device operations or requiring manual intervention.
Solution Approach 2:
Token rotation is performed as a preliminary action before tokens expire. The system proactively generates and distributes new tokens in advance, ensuring seamless continuity of authentication. This preliminary action prevents authentication interruptions and maintains security without requiring time-critical operations during active authentication cycles, thereby minimizing the impact on system operation time.
Data Source
AI summary
In some implementations, a token client may transmit, to a token server, a request for a token associated with the front-end device and derived from a secret associated with the front-end device. The token client may receive, from the token server, the token in response to the request for the token and may transmit, to the front-end device, the token. The token client may determine an expiry associated with the token. The token client may transmit, to the token server, a request for a new token prior to the expiry associated with the token. The token client may receive, from the token server, the new token in response to the request for the new token and may transmit, to the front-end device, the new token.