Microcontroller Authorization Verification for DoS Attack Mitigation

The patent segments the authorization verification process into two distinct phases: a preliminary phase that checks for the presence of authorization credentials using minimal computational resources, and a subsequent phase that performs comprehensive verification only for requests that pass the preliminary check. This segmentation allows IoT end nodes to maintain security while preserving limited computational capacity.

The patent implements a preliminary authorization check that occurs before the main processing logic. This preliminary action filters out unauthorized requests early in the process, preventing them from consuming significant computational resources. The check verifies the presence of authorization credentials using simple comparison operations that are computationally inexpensive for IoT devices.

The patent applies different response qualities based on the authorization status of the request. For unauthorized requests, a standardized generic error message is returned that provides no system information. For authorized requests experiencing errors, detailed debugging information is provided. This local differentiation of information quality maintains security while preserving debugging capabilities.

The patent preemptively prevents security information leakage by implementing a filter that blocks detailed error messages from being sent to unauthorized users. The system anticipates that detailed error messages could be exploited by attackers, so it proactively replaces them with generic messages before they can cause harm, while still allowing detailed messages to reach authorized users who need them for debugging.

The patent performs preliminary authorization verification before allocating network resources or maintaining connections. Requests that fail the preliminary check are rejected immediately without connection establishment or resource allocation. This preliminary action ensures that only authorized users consume network resources, maintaining service availability for legitimate users while preventing DoS attacks from exhausting system resources.

The system implements a self-filtering mechanism where the preliminary authorization check automatically identifies and blocks malicious requests without requiring external intervention. The system serves legitimate users while automatically excluding attackers, making the service resilient to DoS attacks through inherent authorization filtering rather than external protection mechanisms.