Advanced Secure Password Generator with Custom Settings

Description:

This password generation utility provides cryptographically secure password creation with extensive customization options and persistent history tracking. Built with vanilla JavaScript, it demonstrates advanced cryptographic APIs, secure random number generation, and comprehensive user experience features for security-conscious applications. Unlike basic password generators, this implementation features cryptographically secure randomness, persistent password history, customizable character sets, and advanced accessibility features to create a professional security tool that balances power with usability. The application showcases Web Crypto API integration, localStorage persistence, clipboard management, and progressive enhancement - essential capabilities for building security-focused web applications that prioritize both functionality and user experience.

The Challenge:

Most password generators either lack proper security foundations or provide poor user experience. I wanted to create a truly secure, feature-rich password tool that uses proper cryptographic randomness while providing excellent usability, accessibility, and persistent features.

Development Story:

This project combined cybersecurity requirements with modern web development practices. The most complex aspect was implementing the cryptographically secure random number generation system that ensures true randomness while maintaining performance and handling various character set combinations.

Key Challenge: Creating a password generation system that uses proper cryptographic security while providing real-time feedback, persistent history, and excellent accessibility across all user interactions.

Technologies Used:

• HTML5 - Semantic structure with proper form validation and accessibility
• CSS3/SCSS - Responsive design with CSS custom properties and animations
• JavaScript (ES6+) - Cryptographic APIs, localStorage, and dynamic UI
• Web Crypto API - Cryptographically secure random number generation
• Clipboard API - Secure copy-to-clipboard functionality

Technical Architecture:

• Cryptographic Security - Web Crypto API for true random number generation
• Persistent Storage - localStorage integration for password history
• Modular Generation - Separated character set management from password logic
• Accessibility-First - WCAG AA compliance with full keyboard navigation

Technical Implementation:

• Secure Randomness: Web Crypto API for cryptographically secure values
• Password Generation: Guaranteed character inclusion from selected sets
• History Management: Persistent storage with unique identifiers
• Clipboard Integration: Secure copy functionality with visual feedback

Core Functionality:

• Cryptographically secure password generation (8-128 characters)
• Customizable character sets (uppercase, lowercase, numbers, symbols)
• Persistent password history with localStorage
• One-click secure copy to clipboard with visual feedback

User Experience:

• Real-time length adjustment with visual slider
• Persistent password history with copy functionality
• Clear visual feedback for all user actions
• Responsive design optimized for all device sizes

Technical Features:

• Web Crypto API integration for true randomness
• LocalStorage persistence for password history
• Clipboard API for secure copy operations
• Comprehensive input validation and error handling

How to Use:

• Adjust password length using the slider (8-128 characters)
• Select character types to include in generation
• Click 'Generate Password' to create a secure password
• Use copy buttons to securely copy passwords to clipboard

Code Highlight:

// Cryptographically secure random number generation
function getSecureRandomInt(max) {
   const randomBuffer = new Uint32Array(1);
    window.crypto.getRandomValues(randomBuffer);
    return randomBuffer[0] % max;
}

Key Learnings:

• Mastered cryptographic security practices for web applications
• Improved understanding of password security requirements and best practices
• Learned to implement persistent storage with proper data management
• Gained experience with clipboard APIs and secure data handling

Future Enhancements:

• Password strength analysis and scoring
• Export functionality for password history
• Password policy customization and templates
• Offline progressive web app capabilities

Github:

Live demo:

Recommended Tools:

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Features:

• Responsive design
• Minimal design
• Adjustable password length (8-128 characters)
• Customizable character sets (uppercase, lowercase, numbers, symbols)
• Real-time password generation
• One-click copy to clipboard
• Responsive mobile-first design
• Secure client-side processing
• Clean, accessible user interface
• Lightweight (<50KB resources)
• No external dependencies