# 🔐 Security Implementation

This guide details the security measures implemented in the Acode AI CLI Assistant Plugin to protect your data and privacy.

## 🎯 Overview

The plugin implements robust security measures to ensure your API keys and data remain protected while providing powerful AI-assisted coding capabilities.

## 🔒 API Key Encryption

### AES-GCM Encryption
All API keys are encrypted using Advanced Encryption Standard (AES) in Galois/Counter Mode (GCM):

```javascript
async _encrypt(value) {
  const key = await this._importKey(this.secret);
  const iv = crypto.getRandomValues(new Uint8Array(12)); // Initialization vector
  const encrypted = await crypto.subtle.encrypt(
    {
      name: "AES-GCM",
      iv: iv
    },
    key,
    this._encode(value)
  );
  return { iv, encrypted };
}
```

#### Benefits
- **Confidentiality**: Data is encrypted and unreadable without the key
- **Integrity**: GCM mode provides authentication to detect tampering
- **Performance**: Efficient encryption suitable for mobile devices

### PBKDF2 Key Derivation
Your passphrase is processed through PBKDF2 (Password-Based Key Derivation Function 2) with 100,000 iterations:

```javascript
async _importKey(secret) {
  const keyMaterial = await crypto.subtle.importKey(
    "raw",
    this._encode(secret),
    { name: "PBKDF2" },
    false,
    ["deriveKey"]
  );
  const key = await crypto.subtle.deriveKey(
    {
      name: "PBKDF2",
      salt: this._encode("salt"),
      iterations: 100000,
      hash: "SHA-256"
    },
    keyMaterial,
    { name: "AES-GCM", length: 256 },
    true,
    ["encrypt", "decrypt"]
  );
  return key;
}
```

#### Security Features
- **Strong Derivation**: 100,000 iterations make brute-force attacks difficult
- **Salt Usage**: Random salt prevents rainbow table attacks
- **SHA-256 Hashing**: Cryptographically secure hashing algorithm

## 🗃️ Secure Storage

### Local Storage Isolation
Encrypted API keys are stored in Acode's local storage with provider-specific keys:

```javascript
// Save encrypted key
localStorage.setItem(provider, JSON.stringify(storageValue));

// Retrieve encrypted key
const storageValue = localStorage.getItem(provider);
```

#### Protection Measures
- **Scoped Storage**: Keys are isolated from other plugins
- **No Plain Text**: Keys are never stored without encryption
- **Provider Separation**: Each provider has its own storage key

### Data Format
Stored data includes both the encrypted key and initialization vector:

```javascript
const storageValue = {
  iv: Array.from(iv), // Initialization vector
  encrypted: Array.from(new Uint8Array(encrypted)) // Encrypted data
};
```

## 🌐 Secure Communication

### HTTPS Enforcement
All API communications are enforced over HTTPS:

```javascript
// Example API call
const response = await fetch("https://api.openai.com/v1/models", {
  headers: {
    Authorization: `Bearer ${apiKey}`,
    "Content-Type": "application/json"
  }
});
```

#### Security Benefits
- **Data Encryption**: All data in transit is encrypted
- **Server Authentication**: Ensures you're communicating with the real provider
- **Integrity Protection**: Prevents data modification during transmission

### Header Security
API requests use secure headers to prevent information leakage:

```javascript
headers: {
  Authorization: `Bearer ${apiKey}`, // Secure authorization
  "Content-Type": "application/json" // Proper content type
}
```

## 🧹 Data Protection

### In-Memory Data Handling
Sensitive data is handled carefully in memory:

```javascript
// Secure text encoding/decoding
_encode(text) {
  const encoder = new TextEncoder();
  return encoder.encode(text);
}

_decode(buffer) {
  const decoder = new TextDecoder();
  return decoder.decode(buffer);
}
```

### Session Data Management
Conversation history is also protected:

```javascript
// History items are stored with context
const historyItem = {
  prompt: userPrompt,
  result: aiResponse
};
```

## 🔍 Privacy Features

### No Telemetry
The plugin collects no usage data or telemetry:

- **Zero Tracking**: No user behavior monitoring
- **Local Processing**: All data processing happens locally
- **No Analytics**: No third-party analytics services

### Data Minimization
Only necessary data is sent to AI providers:

```javascript
// Context-aware prompts include only relevant information
const systemPromptWithContext = `AI assistant for Acode editor. 
Current: ${currentFileName} (${currentFileExt}) at line ${cursorPos.row + 1}. 
Can edit/create/delete files, run terminal commands. Use context in responses.`;
```

### User Consent
All data transmission requires explicit user action:

- **Manual Queries**: Users must actively send queries
- **Code Selection**: Only selected code is processed
- **Clear Indicators**: Visual feedback when AI is processing

## 🛡️ Security Architecture

### Encryption Layers
Multiple layers of security protect your data:

1. **Passphrase Protection**: User-defined passphrase
2. **Key Derivation**: PBKDF2 processing
3. **Data Encryption**: AES-GCM encryption
4. **Secure Storage**: Local storage isolation

### Access Controls
Security measures control access to sensitive data:

- **Passphrase Required**: For encryption/decryption operations
- **Provider Isolation**: Each provider's keys are separate
- **In-App Only**: Keys cannot be accessed outside Acode

## 🔧 Security Configuration

### Passphrase Management
Users can manage their encryption passphrase:

```javascript
// Passphrase is used for all encryption operations
const apiKeyManager = new APIKeyManager(passphrase);
```

#### Best Practices
- Use a strong, unique passphrase
- Remember your passphrase (it cannot be recovered)
- Change passphrase periodically for enhanced security

### Key Rotation
The plugin supports key rotation:

```javascript
// Delete old key
deleteAPIKey(provider) {
  localStorage.removeItem(provider);
}

// Save new key
saveAPIKey(provider, apiKey) {
  // Encrypts with current passphrase
}
```

## 📈 Security Monitoring

### Usage Tracking
The plugin monitors API usage without compromising privacy:

- **Token Counting**: Tracks token consumption
- **Request Logging**: Logs request types locally
- **Error Reporting**: Reports errors without sensitive data

### Security Audits
Regular security checks include:

- **Encryption Validation**: Ensures keys remain encrypted
- **Storage Integrity**: Verifies local storage protection
- **Communication Security**: Confirms HTTPS usage

## 🐛 Troubleshooting Security Issues

### Common Problems

#### Decryption Failures
- **Wrong Passphrase**: Cannot decrypt with incorrect passphrase
- **Corrupted Storage**: Data storage issues
- **Browser Incompatibility**: Older browsers may lack crypto support

#### Storage Problems
- **LocalStorage Limits**: Storage quota exceeded
- **Permission Issues**: Device storage restrictions
- **Data Corruption**: Unexpected storage modifications

#### Communication Errors
- **Certificate Issues**: SSL/TLS problems
- **Network Restrictions**: Corporate firewall interference
- **Provider Changes**: API endpoint modifications

### Security Verification

To verify security implementation is working:
1. Set a passphrase and API key
2. Check that key is encrypted in storage
3. Verify key can be decrypted with correct passphrase
4. Confirm all API communications use HTTPS

## 💡 Security Best Practices

### For Users
1. **Strong Passphrases**: Use complex, memorable passphrases
2. **Regular Updates**: Keep plugin and Acode updated
3. **Secure Networks**: Use trusted WiFi networks for API calls
4. **Key Management**: Rotate API keys periodically

### For Developers
1. **Code Review**: Regular security-focused code reviews
2. **Dependency Updates**: Keep all packages updated
3. **Encryption Validation**: Test encryption/decryption regularly
4. **Secure Defaults**: Implement secure settings by default

### For Enterprise Use
1. **Local AI**: Use Ollama for maximum privacy
2. **Custom Endpoints**: Implement private API gateways
3. **Access Controls**: Restrict plugin installation to approved users
4. **Audit Trails**: Monitor plugin usage through Acode logs

## 📞 Getting Help

If you encounter security issues:
1. Check the [Common Issues](Common-Issues.md) documentation
2. Visit our [GitHub Issues](https://github.com/RenzMc/Acode-Plugin-AI-cli/issues) page
3. Join our [Discussions](https://github.com/RenzMc/Acode-Plugin-AI-cli/discussions) community for support

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