HTTP Header Challenge-Response Mechanism for CSRF Prevention

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Solution Overview

Problem

Cross-Site Request Forgery (CSRF) attacks exploit trust between users and websites, allowing malicious users to perform unauthorized actions by leveraging authenticated sessions, posing a significant risk to both victims and websites.

Innovation Solution

Implementing a challenge-response mechanism within HTTP headers to authenticate requests, where a server generates a random nonce and includes it in the response, which the client must correctly respond to in subsequent requests to ensure legitimacy, thereby preventing unauthorized actions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a challenge-response mechanism is implemented in HTTP headers, then CSRF attack prevention is improved, but system complexity increases

Engineering Contradiction:

ImproveCSRF attack preventionVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The server generates and sends a challenge (nonce) to the client before processing the actual request. The client must respond with the correct nonce value in the HTTP header, proving legitimate authentication. This preliminary challenge-response action prevents CSRF attacks by ensuring only authenticated clients can proceed with their requests.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If challenge-response authentication is implemented, then security against unauthorized actions is improved, but performance overhead increases

Engineering Contradiction:

ImprovesecurityVSAvoidperformance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The authentication mechanism extracts only the essential nonce verification from the request processing flow. The server sends a nonce in the HTTP header and verifies its presence and correctness in the response header, without requiring extensive additional processing or system changes. This extraction approach maintains security while minimizing performance overhead.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If extensive system changes are made to prevent CSRF, then attack prevention is improved, but ease of implementation deteriorates

Engineering Contradiction:

Improveattack preventionVSAvoidease of implementation

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The challenge-response mechanism using HTTP headers is designed to be universally applicable across different web applications and servers. It leverages existing HTTP header infrastructure, requiring minimal modifications to current systems while providing robust CSRF protection. The same mechanism can be implemented across multiple applications without requiring application-specific customization.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9356951B2Responses to server challenges included in a hypertext transfer protocol header

Publication Date: 2016.05.31 MICRO FOCUS LLC

AI summary

Example embodiments relate to verification of client requests based on a response to a challenge (135; 235) included in an HTTP Header. In some embodiments, a server computing device (100; 300; 350) may generate a challenge (130; 230) in response to receipt of a request from a client (200; 330; 380) and may include a random nonce with the challenge. In some embodiments, the server computing device (100; 300; 350) may then verify that a second request includes, in an HTTP header, a response to the challenge (135; 235) that corresponds to the random nonce. Additional example embodiments relate to transmission of a response to a challenge from a client computing device (200; 330; 380) to the server (100; 300; 350).