Secure Communications
Built for Those Who
Cannot Afford a Breach
Military-grade end-to-end encrypted messaging, voice, and video for defence agencies, law enforcement, and government — deployed entirely within your infrastructure.
Platform Capabilities
Everything your agency needs. Nothing it doesn't.
A complete sovereign communications stack — no SaaS dependencies, no third-party data handling, no compromise.
End-to-End Encrypted Messaging
Signal Protocol Double Ratchet with one-time encryption keys. Server never sees plaintext — cryptographically impossible.
Encrypted Voice & Video Calls
DTLS-SRTP encrypted calls supporting up to 150 conference participants. WebRTC via self-hosted mediasoup SFU.
Hierarchical Spaces
Org-mapped communication structure. Departments, missions, units — with role-based access and broadcast groups.
Secure File Transfer
Per-file encryption keys, SHA-3-256 integrity verification, no file size limits. Files expire and are cryptographically wiped.
Controlled Federation
Communicate with approved partner agencies under a closed federation policy. Every link is explicitly authorised.
Full Admin Control
Web-based system and user admin interface. Certificate management, retention policies, audit logs, threat detection.
Secure Messaging
Messages that disappear. Keys that never existed.
Every message is encrypted with a unique one-time key. When it expires, both the content and the key are cryptographically wiped — not deleted, destroyed.
- Default and per-message expiry
- Sent, delivered, read indicators
- Threads, reactions, polls
- No message forwarding (configurable)
- Screenshot prevention on all platforms
Who We Serve
Built for the agencies that secure our world.
Defence & Military
Classified communications for army, navy, and air force. Air-gap deployable on classified networks. FIPS 140-3 compliant.
Learn more02Central Government
ISO 27001 certified for UK government data handling. GDPR compliant. On-premises within government data centres.
Learn more03Law Enforcement
Secure operational communications. Evidence-grade audit logs. Legal hold and eDiscovery support. MDM integration.
Learn more04Intelligence Services
SECRET and TOP SECRET classification levels. Full traffic relay — no direct user-to-user connections.
Learn moreCryptographic Architecture
Military-grade encryption.
Quantum-resistant future.
Every cryptographic primitive is NIST-approved. Post-quantum hybrid key exchange ships today — not as a roadmap item.
Read the technical spec →Key Exchange
X25519 + ML-KEM-768
Hybrid post-quantum key exchange. Classical and post-quantum protection in parallel. NIST FIPS 203.
Messaging
Signal Double Ratchet
AES-256-GCM symmetric encryption. HKDF-SHA256 key derivation. Forward secrecy guaranteed.
Signatures
Ed25519 + Dilithium-3
Dual hybrid JWT signing. Both classical and post-quantum signatures on every token. NIST FIPS 204.
Key Storage
Hardware-Backed Keys
iOS Secure Enclave · Android StrongBox · Windows TPM 2.0. Private keys never leave hardware.
Transport
mTLS Everywhere
TLS 1.3 with mutual authentication on all service-to-service communication. CFSSL PKI.
Calls
DTLS-SRTP
All voice and video encrypted with DTLS-SRTP. WebRTC via self-hosted SFU — no media relay outside your network.
Platform Comparison
Why agencies choose IMCS
A direct comparison against the two most commonly considered alternatives in government and defence procurement.
| Capability | Element ESS | Microsoft Teams | IMCS |
|---|---|---|---|
| Deployment & Sovereignty | |||
| On-premises deployment | Limited | ||
| Air-gap / no internet | — | — | |
| Data residency — your jurisdiction | — | ||
| Zero third-party cloud | — | ||
| Federation model | Matrix (open) | Teams only | Closed (approved only) |
| Encryption & Security | |||
| End-to-end encryption | Transport only | ||
| Post-quantum encryption (active) | Roadmap | — | ML-KEM-768 live |
| FIPS 140-3 compliance | Partial | GCC High only | |
| Hardware-backed keys | Varies by client | — | |
| Traffic relay (no traffic analysis) | — | — | |
| Screenshot prevention all platforms | Limited | — | |
| Classification & Compliance | |||
| Classification labels | — | — | |
| ISO 27001 certified | In progress | ||
| Immutable audit log | Basic | Cloud-only | |
| Legal hold + eDiscovery | — | ||
| UK GDPR data residency | UK region option | ||
| Communications | |||
| Encrypted voice + video | |||
| Conference participants | 50+ | 1000+ | 150+ E2EE |
| Message expiry (per message) | — | — | |
| Self-hosted SFU | — | — | |
| Satellite / low-bandwidth | Basic | — | |
| Platforms | |||
| iOS / Android / Windows / Web | |||
| Linux desktop client | Web only | ||
| MDM / enterprise deployment | |||
| Commercial Model | |||
| Licensing model | Subscription / ESS | Per-user | Perpetual licence |
| Ongoing cloud fees | Optional | Required | None |
| Protocol | Matrix (open) | Proprietary | Signal Protocol + PQ |
| Source availability | Open source | Closed | Commercial / auditable |
| Request Demo → | |||
“IMCS gives us the operational security of classified communications infrastructure with the usability our personnel actually adopt. The server-side encryption guarantee is non-negotiable for our use case.”
Licensing
Perpetual licence. Your infrastructure. Your data.
No subscription lock-in. Deployed entirely on your infrastructure.
Plan A
Up to 500 users
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- All core messaging and calling features
- iOS, Android, Windows, Linux, macOS, Web clients
- Admin console (single agency)
- On-premises deployment
- 12-month support and updates included
- On-site installation by trained personnel
Plan B
Up to 2,500 users
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- Everything in Plan A, plus:
- Federation (up to 3 approved partner agencies)
- LDAP / Active Directory integration
- OIDC / SSO integration
- Air-gap deployment support and tooling
- Priority support — 24h response SLA
- Quarterly security review call
Enterprise
Unlimited users
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- Everything in Plan B, plus:
- Multi-agency B2B admin portal
- Unlimited federation partners
- White-label and custom branding
- Dedicated support engineer
- On-site installation and 3-day training programme
- Custom compliance framework support
Ready to secure your agency's communications?
Speak with our team about deployment requirements, compliance needs, and licensing. No obligation.