> ## 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. # Core Concepts > Understand the foundational ideas behind Offline Protocol, including networking, security, and communication mechanisms. Offline Protocol is designed to enable resilient, community-driven communication and interaction even in environments with unreliable or no internet access. It combines local networking, cryptographic security, and decentralized coordination to create a parallel layer of connectivity. ## Core Components of the Offline Protocol * **Device Discovery**\ Uses Bluetooth LE or Wi-Fi Direct to detect and connect with nearby peers without relying on cellular networks or traditional infrastructure. * **Session Establishment**\ Secure handshake process with asymmetric cryptography (public/private key exchange) to ensure authenticity and confidentiality. * **Message Relay**\ Opportunistic relay nodes can extend communication range by forwarding data across devices, creating mesh-like connectivity. * **Store-and-Forward**\ Messages are cached temporarily on intermediate devices until the intended recipient becomes available, ensuring eventual delivery even without constant connectivity. * **Cryptographic Security**\ Every message is signed and optionally encrypted, ensuring tamper-proof communication and protecting user privacy. * **Decentralized Identity**\ Users can establish self-sovereign identities tied to cryptographic keys, enabling trust without centralized authorities. * **Local-First Networking**\ Communication prioritizes proximity—devices exchange data directly before relying on internet gateways, reducing dependency on centralized servers. * **Resilient Communication Layer**\ By working independently of the global internet, Offline Protocol creates a fallback communication system during outages, censorship, or disasters. Message relays