> ## Documentation Index
> Fetch the complete documentation index at: https://www.offlineprotocol.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Security & Privacy

> Explore the cryptographic backbone that secures all interactions in Offline Protocol.

Offline Protocol is built with security-first principles, ensuring confidentiality and trust even in hostile environments.

## Core Security Features

<CardGroup cols={2}>
  <Card title="End-to-End Encryption" icon="lock">
    AES-256 encryption secures all messages.
  </Card>

  {" "}

  <Card title="ECC Key Exchanges" icon="key">
    Lightweight, secure session establishment using elliptic curve cryptography.
  </Card>

  {" "}

  <Card title="Public/Private Key Pairs" icon="shield">
    Keys are never transmitted—only generated and used locally.
  </Card>

  <Card title="Zero-Knowledge Proofs" icon="shield-check">
    Validate actions without revealing sensitive data.
  </Card>
</CardGroup>

## Fraud Prevention

<CardGroup cols={2}>
  <Card title="Replay Attack Protection" icon="shield-check">
    Unique message signatures prevent duplication or tampering.
  </Card>

  {" "}

  <Card title="Device Authentication" icon="user-check">
    Lightweight cryptographic challenges secure relay nodes.
  </Card>

  {" "}

  <Card title="Merkle Tree Structures" icon="list">
    Enables efficient, tamper-resistant transaction validation.
  </Card>

  <Card title="Consensus on Reconnect" icon="repeat">
    Local transactions automatically sync globally once internet access returns.
  </Card>
</CardGroup>