SCEP Validation Service Preventing Unauthorized Certificate Issuance

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Solution Overview

Problem

The Simple Certificate Enrollment Protocol (SCEP) lacks authentication and content validation for certificate enrollment requests, particularly in less-trusted environments, allowing potential misuse of challenge passwords for unauthorized certificate issuance.

Innovation Solution

A system and method for validating SCEP certificate enrollment requests by allowing trusted users to register SCEP challenges and associated expected certificate content, electronically receiving and validating certificate requests through a SCEP Validation Service that checks for matching challenges and content, ensuring authorized certificate issuance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If SCEP challenge passwords are used for authorization without authentication, then ease of certificate enrollment is improved, but security against unauthorized certificate issuance deteriorates

Engineering Contradiction:

Improveease of certificate enrollmentVSAvoidsecurity against unauthorized issuance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system performs preliminary authentication and validation actions before certificate issuance. The CA validates the requester's identity and authenticates the challenge password before processing the enrollment request, preventing unauthorized certificate issuance while maintaining ease of enrollment for legitimate users

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary validation mechanism between the SCEP client and CA. The system acts as a mediator that verifies both the authenticity of the challenge password and the validity of the certificate request content, resolving the contradiction by adding a security layer without complicating the enrollment process for authenticated users

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If SCEP servers accept any certificate request content, then adaptability of the system is improved, but risk of privilege escalation and misuse increases

Engineering Contradiction:

Improveacceptance of any certificate requestVSAvoidprivilege escalation and misuse risk

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The system implements feedback mechanisms where the CA validates the certificate request content against security policies before issuance. The validation process provides feedback to determine whether the request should be approved or rejected, allowing the system to maintain adaptability for legitimate requests while blocking harmful ones

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary anti-action by implementing validation rules that prevent harmful certificate requests before they can cause damage. The system proactively identifies and rejects requests that would lead to privilege escalation or misuse, while still accepting legitimate diverse certificate enrollment requests

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentEP2954638B1System and method for validating SCEP certificate enrollment requests

Publication Date: 2018.08.08 CERTIFIED SECURITY SOLUTIONS

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AI summary

A system and method for validating SCEP certificate enrollment that enforces the pairing of a SCEP challenge password and a set of expected certificate request content. A SCEP Validation Service or software residing in another system component whether a certificate request is legitimate by comparing it to registered SCEP challenges and associated expected certificate request content. This system and method addresses a privilege -escalation vulnerability in prior SCEP-based systems that could lead to a practical attack.