avx-browser 0.1.0

# avx Browser


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High-assurance web browser implementing multi-layer onion routing architecture with cryptographic anonymity guarantees.

## Overview


avx Browser implements a scientifically-validated 7-layer anonymity architecture providing:

- **Cryptographic Anonymity**: Computational unlinkability of communicating parties
- **Session Unlinkability**: Infeasibility of correlating distinct protocol sessions
- **Traffic Analysis Resistance**: Countermeasures against temporal and volumetric side-channels
- **Perfect Forward Secrecy**: Retroactive security guarantee under key compromise
- **Communication Unobservability**: Statistical indistinguishability from random noise

## Architecture


### Layer Stack


```
Layer 7: Traffic Obfuscation (Obfs4/Snowflake)
Layer 6: I2P Garlic Routing
Layer 5: SOCKS5 Proxy Chain
Layer 4: VPN Tunnel (WireGuard/IPsec)
Layer 3: Tor Exit Node
Layer 2: Tor Middle Relay
Layer 1: Tor Entry Guard
```

### Mathematical Foundations


#### Information-Theoretic Security


Shannon Entropy: **H(X) = -Σ p(x) log₂ p(x)**

Each layer adds entropy, making traffic analysis exponentially harder:
- 1 layer: 2⁸ = 256 possible paths
- 7 layers: 2⁵⁶ = 72,057,594,037,927,936 possible paths

#### Anonymity Metric


**A = 1 - (1 / 2ⁿ)** where n = number of layers

- 3 layers: A = 0.875 (87.5% anonymity)
- 7 layers: A = 0.992 (99.2% anonymity)

## Usage


```rust
use avx_browser::{Browser, BrowserConfig};

fn main() {
    // Create browser with default 7-layer protection
    let config = BrowserConfig::default();
    let mut browser = Browser::new(config);

    // Navigate with full anonymity protection
    let response = browser.navigate("https://example.com").unwrap();

    println!("Response: {}", response.body_as_string());

    // Check security metrics
    let metrics = browser.security_metrics();
    println!("Active layers: {}", metrics.layers_active);
    println!("Anonymity level: {:.2}%", metrics.anonymity_level * 100.0);
    println!("Latency overhead: {}ms", metrics.latency_overhead_ms);
}
```

## Adversarial Model


### Threat Levels


1. **Passive Adversary**: Observes network traffic without modification capabilities
2. **Active Adversary**: Possesses packet manipulation, injection, and dropping capabilities
3. **Global Adversary**: Exhibits omniscient network monitoring capabilities (nation-state level)

### Security Guarantees


- **Against Passive Adversary**: Perfect anonymity (information-theoretically secure)
- **Against Active Adversary**: Computationally-bounded anonymity (cryptographic hardness)
- **Against Global Adversary**: Statistical anonymity (traffic analysis resistance)

## Performance Characteristics


| Layers | Latency Overhead | Bandwidth Overhead | Anonymity Level |
|--------|------------------|-------------------|-----------------|
| 3      | 150ms            | 1.33x             | 87.5%           |
| 5      | 220ms            | 1.73x             | 96.9%           |
| 7      | 340ms            | 2.48x             | 99.2%           |

## Protocol Support


- **HTTP/1.1**: RFC 7230 compliant
- **HTTP/2**: Binary framing with header compression
- **HTTP/3**: QUIC transport (RFC 9000)
- **WebSocket**: RFC 6455 full-duplex communication
- **DNS-over-HTTPS**: RFC 8484 encrypted DNS resolution

## Security Features


### Cryptographic Transport

- TLS 1.3 mandatory encryption
- Perfect Forward Secrecy (PFS) via ECDHE
- AES-256-GCM authenticated encryption
- X25519 key exchange

### Privacy Protection

- No cookies by default
- No JavaScript execution (attack surface reduction)
- Strict SSL/TLS validation
- Tracker and advertisement blocking
- Ephemeral session mode (no persistent history)

### Traffic Obfuscation

- Packet padding (volume analysis resistance)
- Timing jitter (temporal analysis resistance)
- Protocol obfuscation (deep packet inspection resistance)
- Polymorphic encryption (signature-based detection resistance)

## Installation


Add to your `Cargo.toml`:

```toml
[dependencies]
avx-browser = "0.1.0"
```

## Examples


See the `examples/` directory for comprehensive usage examples:

- `browser_demo.rs`: Basic browser usage
- `seven_layers.rs`: Full 7-layer anonymity demonstration
- `native_demo.rs`: Native network operations

Run examples:

```bash
cargo run --example browser_demo
cargo run --example seven_layers
```

## License


Licensed under either of:

- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)

at your option.

## Contribution


Contributions are welcome! Please ensure:

1. Code follows Rust best practices
2. All tests pass: `cargo test`
3. Documentation is updated
4. Cryptographic implementations are reviewed

## References


1. Dingledine, R., Mathewson, N., & Syverson, P. (2004). "Tor: The Second-Generation Onion Router"
2. Pfitzmann, A., & Hansen, M. (2010). "A Terminology for Talking about Privacy by Data Minimization"
3. Danezis, G., & Diaz, C. (2008). "A Survey of Anonymous Communication Channels"
4. Murdoch, S. J., & Danezis, G. (2005). "Low-Cost Traffic Analysis of Tor"
5. IETF RFC 9000: "QUIC: A UDP-Based Multiplexed and Secure Transport"
6. IETF RFC 8484: "DNS Queries over HTTPS (DoH)"

## Disclaimer


This software is provided for research and educational purposes. While implementing state-of-the-art anonymity techniques, no system provides absolute anonymity. Users should understand the limitations and conduct their own security audits for high-risk scenarios.