Certificate Management System for Medical Imaging

The cert_helper.rs module provides comprehensive certificate management capabilities for securing medical imaging systems, implementing Public Key Infrastructure (PKI) with X.509 certificates and OpenSSL integration.

Security Architecture

Certificate Authority (CA) Management

Implements a complete CA system for issuing and managing certificates within medical imaging environments.

Client Certificate Generation

Generates client certificates with machine-specific bindings for enhanced security.

Server Certificate Management

Creates server certificates for HTTPS and DICOM TLS connections.

Key Features

Automated Certificate Generation

  • CA root certificate generation with 4096-bit RSA keys
  • Client certificate issuance with custom extensions
  • Server certificate creation for secure communications

Certificate Validation

  • Signature verification using public key cryptography
  • Extension validation for machine-specific bindings
  • Expiration date checking

Machine Identity Binding

Uses custom X.509 extensions to bind certificates to specific machine identities, preventing certificate misuse.

Technical Implementation

OpenSSL Integration

Leverages OpenSSL for cryptographic operations including:

  • RSA key generation (4096-bit for maximum security)
  • X.509 certificate creation and signing
  • Digital signature generation and verification
  • Certificate parsing and validation

Custom Extensions

Implements custom OID extensions for healthcare-specific requirements:

  • Machine identity binding (OID: 1.3.6.1.4.15967132172.1)
  • Healthcare organization identification

Security Benefits

  1. End-to-End Encryption: Secures data transmission between medical imaging systems
  2. Identity Verification: Ensures only authorized systems can access sensitive data
  3. Non-Repudiation: Digital signatures provide proof of data origin and integrity
  4. Compliance: Meets healthcare security standards and regulations

Healthcare-Specific Features

  • Machine Binding: Prevents certificate copying between systems
  • Long-Term Validity: 10-year certificate lifecycles for stable deployments
  • Organization Verification: Certificate subject validation for healthcare entities

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