Security Guide

🔒 Security Guide

Security Features

Cryptographic Random Number Generation

UUID uses cryptographically secure random number generation to ensure unpredictability:

public class UUID
{
    private static readonly ThreadLocal<RandomNumberGenerator> Rng =
        new(() => RandomNumberGenerator.Create());

    private static void GetRandomBytes(byte[] buffer)
    {
        Rng.Value?.GetBytes(buffer);
    }
}

Thread Safety

All operations are thread-safe through:

• Immutable design
• Thread-local random number generation
• Lock-free operations

Best Practices

1. Storage and Transmission

// DO: Use Base32 for URL-safe representation
string urlSafeId = uuid.ToBase32();

// DON'T: Use raw byte arrays in URLs
byte[] bytes = uuid.ToByteArray(); // Not URL-safe

2. Database Security

// DO: Use parameterized queries
using var cmd = new SqlCommand(
    "SELECT * FROM Users WHERE Id = @Id",
    connection);
cmd.Parameters.AddWithValue("@Id", uuid.ToString());

// DON'T: Use string concatenation
string query = $"SELECT * FROM Users WHERE Id = '{uuid}'"; // Vulnerable to SQL injection

3. API Security

// DO: Validate UUIDs in API endpoints
[HttpGet("{id}")]
public IActionResult Get(string id)
{
    if (!UUID.TryParse(id, out var uuid))
    {
        return BadRequest("Invalid UUID format");
    }
    // Process valid UUID
}

Common Security Concerns

1. UUID Predictability

UUIDs generated by this library are not predictable because:

• Cryptographic random number generation
• Time-based component adds entropy
• Thread-local generation prevents patterns

2. Timing Attacks

The library is resistant to timing attacks:

• Constant-time comparison operations
• No sensitive information in generation process
• No secret-dependent branches

3. Information Disclosure

// DO: Use appropriate string formats
public class UserDto
{
    public string Id { get; set; } = uuid.ToString();
}

// DON'T: Expose internal byte representation
public class UserDto
{
    public byte[] Id { get; set; } = uuid.ToByteArray();
}

Security Checklist

Implementation

• Cryptographic random number generation
• Thread-safe operations
• Constant-time comparisons
• Immutable design
• No sensitive data exposure

Usage

• Validate all UUID inputs
• Use parameterized queries
• Implement proper access controls
• Log security events
• Regular security audits

Reporting Security Issues

If you discover a security vulnerability:

1. DO NOT open a public issue
2. Email taiizor@vegalya.com
3. Include detailed information about the vulnerability
4. Wait for confirmation before disclosure

Security Updates

• Subscribe to our security mailing list
• Monitor our Security Advisories
• Check Changelog for security-related updates

Additional Resources

• OWASP Security Cheat Sheet
• .NET Security Guidelines
• Cryptographic Standards