🏢 NationalIT Certificate Portal

🎯 Purpose

This web application provides a secure and convenient way to distribute NationalIT SSL certificates across all your devices. It allows users to easily download and install certificate files with device-specific instructions, ensuring secure connectivity to NationalIT services.

📁 Supported Certificate Formats

• .pem - Privacy Enhanced Mail (Base64 encoded)
• .crt - Certificate file (usually Base64 encoded)
• .cer - Certificate file (can be DER or Base64)
• .der - Distinguished Encoding Rules (binary)
• .p12/.pfx - PKCS#12 format (contains certificate and private key)
• .key - Private key file
• .p7b/.p7c - PKCS#7 format (certificate chain)

🔒 Security Features

• Secure filename validation to prevent directory traversal attacks
• File type validation to ensure only certificate files are served
• Safe file serving with proper MIME type detection
• Read-only access - no file upload functionality through web interface
• Error handling to prevent information disclosure

🚀 Features

• File Listing: View all available certificate files with details
• Secure Downloads: Download certificates with proper file handling
• Certificate Viewing: View text-based certificates (.pem, .crt, .cer, .key) in the browser
• Format Detection: Automatic recognition of certificate file types
• Responsive Design: Works on desktop and mobile devices
• File Information: Display file sizes and format descriptions

📖 Usage Instructions

1. Select your device type from the main page (iOS, Android, Windows, etc.)
2. Download the appropriate certificate for your device
3. Follow the device-specific installation instructions provided
4. Verify the certificate is properly installed and trusted
5. Contact NationalIT support if you need assistance