Delta: Enterprise Secure Messaging Platform, Self-Hosted and End-to-End Encrypted

Military-grade encryption. Zero Trust architecture. 100% self-hosted. 100% your control. Delta brings secure chat, calls, meetings, emergency alerts and even offline mesh messaging to your organization, entirely on your own infrastructure.

  • Signal Protocol E2EE
  • On-premises, air-gapped or private cloud
  • Offline BLE mesh chat
  • Android, iOS, Desktop & Web
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Delta enterprise secure messaging app on desktop and mobile showing encrypted chats, calls and meetings
  • E2EEEnd-to-end encrypted
  • ZeroThird-party dependency
  • 100%On-premises control
  • 4Layers of resilience

Communicate securely, with 100% your control

Delta is an enterprise secure messaging platform built on Signal Protocol encryption, the same proven cryptography trusted by security agencies worldwide. Chats, calls, meetings and media stay end-to-end encrypted, and the entire platform is hosted by you, on-premises, air-gapped or in a private cloud, with zero third-party dependency.

When networks fail, Delta keeps going: BLE mesh messaging works with no internet, and a four-layer architecture gives you automatic failover for disaster response and field operations.

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Delta secure messaging platformZoom

Key capabilities

Everything your organization needs for secure communication in one self-hosted platform.

Signal Protocol encryption

Same proven cryptography trusted by security agencies worldwide, protecting chat, calls and media end to end.

Self-hosted deployment

On-premises, air-gapped or private cloud: you choose, with zero third-party dependency.

Multi-platform clients

Android, iOS, Desktop (Windows, Mac, Linux) and Web PWA, so every team member stays connected.

Admin console

Full organizational control over users, devices, policies and audit.

Video conferencing

Group video calls with screen sharing for up to 50 participants.

BLE mesh network

Off-grid communication when the internet is unavailable.

Platform features

Secure messaging, calling, meetings and safety tools that work together.

Secure messaging

  • 1:1 and group chat: E2E encrypted text, voice and media
  • Disappearing messages: auto-delete with configurable timers
  • Media encryption: photos, videos and documents encrypted at rest

Voice & video calling

  • Encrypted 1:1 calls: P2P WebRTC with SRTP encryption
  • Group video conference: up to 50 participants with screen share
  • Add participants: seamlessly add contacts mid-call

Delta Meet

  • Instant meetings: one-tap create or join with a shareable link
  • Schedule meetings: calendar invite with auto-generated room
  • Meeting history: track past meetings and participants

Safety & emergency

  • SOS panic button: emergency alert with GPS location
  • Emergency broadcast: lockdown, evacuate, all clear
  • Geofencing: admin zones with violation alerts

Security architecture

A Zero Trust design where encryption, identity and infrastructure all stay under your control.

Signal Protocol encryption features

  • Device verification
  • Certificate pinning
  • Sealed sender
  • Relay server
  • Enterprise identity
  • Self-contained infrastructure

Secure communication framework

  • Signal Protocol encryption: proven cryptography trusted by security agencies worldwide
  • Self-hosted deployment: on-premises, air-gapped or private cloud
  • Multi-platform clients: Android, iOS, Desktop and Web PWA
  • Admin console: full control over users, devices and policies

BLE mesh network: chat without internet

When there is no internet, no cell towers and no Wi-Fi, Delta devices still talk to each other.

Offline mesh chat

Private and broadcast messaging between nearby devices, with no internet, no cell towers and no Wi-Fi required.

Contact discovery

Auto-detect nearby Delta users via Bluetooth scanning and see who is in range within 30 seconds.

Multi-hop relay

Messages hop between devices to extend range beyond 100 m, with each phone acting as a relay node.

SOS emergency beacon

One-tap emergency broadcast with GPS coordinates to all nearby peers, working without any network.

Multi-nodal architecture: four layers of resilience

For disaster response and field operations, Delta deploys portable server nodes that auto-discover each other and sync contacts over any available radio. Each node is a laptop running the full Delta server.

  1. Layer 1: Internet

    Central server in normal mode, with full features.

  2. Layer 2: Private LTE

    Multi-nodal via Lemko / Rajant, supporting voice and video.

  3. Layer 3: BLE Mesh

    Phone-to-phone with 100 m range, supporting text and SOS.

  4. Layer 4: LoRa

    Meshtastic nodes with 10 km range, supporting text only.

Zero single point of failure If one layer fails, the next takes over automatically.

Delta brochure

Read the details online or download the PDF to share with your team.

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Delta FAQ

Quick answers on encryption, deployment, calling and offline messaging.

What is Delta?

Delta is mPHATEK’s enterprise secure messaging platform. It offers end-to-end encrypted chat, calls, meetings and media, Zero Trust architecture and 100% self-hosted deployment, so your organization keeps full control of its communications.

What encryption does Delta use?

Delta uses Signal Protocol end-to-end encryption for chat, calls and media. Disappearing messages auto-delete with configurable timers, and photos, videos and documents are encrypted at rest. Device verification, certificate pinning and sealed sender add further protection.

Can Delta be self-hosted or run air-gapped?

Yes. Delta can be deployed on-premises, air-gapped or in a private cloud, with zero third-party dependency, so you choose where your data and infrastructure live.

Which devices and platforms does Delta support?

Delta provides clients for Android, iOS, Desktop (Windows, Mac and Linux) and a Web PWA.

Does Delta support secure calls and meetings?

Yes. Delta offers encrypted 1:1 voice and video calls using peer-to-peer WebRTC with SRTP, group video conferences with screen sharing for up to 50 participants, and Delta Meet for instant or scheduled meetings with shareable links and meeting history.

What happens when there is no internet?

Delta’s BLE mesh network enables offline chat between nearby devices without internet, cell towers or Wi-Fi, with multi-hop relay beyond 100 metres and an SOS emergency beacon. For field operations, Delta adds four layers of resilience: Internet, Private LTE, BLE Mesh and LoRa, with automatic failover.

What admin and safety controls are included?

The admin console gives full organizational control over users, devices, policies and audit. Safety features include an SOS panic button with GPS location, emergency broadcasts such as lockdown, evacuate and all clear, and geofencing alerts for admin-defined zones.

How can I get a Delta demo or proof of concept?

Use the enquiry form on this page, email contact@mphatek.com or visit our Contact Us page to request a demo or a proof-of-concept deployment.

Ready to secure your communications?

Contact us for a demo or proof-of-concept deployment of Delta.

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Secure messaging that stays 100% in your control.

Request a demo of Delta and see encrypted chat, calls and offline mesh messaging in action.

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