Proof-of-Work Mechanism for Network Load Management
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Solution Overview
Problem
Systems accessible through networks, such as the Internet, are susceptible to overload due to concurrent access attempts, which can lead to unresponsiveness or complete system failure, often caused by sudden popularity or malicious denial of service (DoS) attacks, making it difficult to manage system load effectively.
Innovation Solution
Implementing a proof of work mechanism where clients must complete computationally challenging tasks, such as hash functions or prime factorization, before their requests are processed, making DoS attacks more difficult to sustain by requiring significant computing resources, and allowing the system to verify the completion of these tasks efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the system allows concurrent access attempts without restrictions, then ease of operation is improved, but system reliability deteriorates due to overload and DoS attacks
Solution Approach 1:
The system performs preliminary actions by requiring clients to complete proof-of-work challenges before processing their requests. This preliminary computational task verifies client legitimacy in advance, preventing overload and DoS attacks before they can impact system stability while maintaining accessibility for legitimate users
Solution Approach 2:
The proof-of-work mechanism acts as an intermediary between the client and the system. It introduces a verification layer that filters malicious requests while allowing legitimate ones through, resolving the contradiction between ease of access and system reliability by mediating the interaction through computational verification
2Reliability
If the system requires proof of work from clients, then system reliability is improved by preventing DoS attacks, but device complexity increases due to the additional verification mechanism
Solution Approach 1:
The system implements self-service by having clients perform their own proof-of-work computations and submit the results for verification. This shifts the computational burden from the server to the client, maintaining system reliability while minimizing the complexity of server-side verification infrastructure
Solution Approach 2:
The proof-of-work challenges use inexpensive, easily generated computational puzzles that are discarded after verification. These temporary computational objects provide security without requiring complex, persistent infrastructure, thus improving reliability while limiting complexity growth
3Productivity
If the system processes all requests without filtering, then productivity is improved by handling more traffic, but loss of energy increases due to processing malicious requests
Solution Approach 1:
The system extracts and filters out malicious requests through the proof-of-work verification mechanism before they can consume system resources. By separating legitimate from malicious traffic at the entry point, the system maintains productivity for valid requests while eliminating energy waste on attack traffic
Data Source
AI summary
System load, such as load caused by a denial of service attack, is managed by requiring those requesting access to the system to provide proof of work. A system receives, from a requestor, a request for access to the system. Before the request can be processed, the system provides a challenge to the requestor. The requestor obtains a solution to the challenge and provides proof of having obtained the solution. The system verifies the correctness of the solution and, if the correct solution is verified, the system services the request.