Quantum-resistant secure communication service

KvantPhone is designed for businesses and large organizations that need state-of-the-art protection for their communication without compromising usability — no backdoor of any kind, guaranteed.

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Total security is the #1 Feature

Secure peer-to-peer communication with end-to-end post-quantum encryption.

KvantPhone uses a peer-to-peer approach with an end-to-end encryption architecture that directly connects the communicating parties. No central servers are involved. Encryption happens on each user’s device.

Only the communicating parties have access to the one-time encryption keys, so only they can decipher the calls and messages. Third-party access, including access by KvantPhone staff, is impossible.

All this is 100% quantum resilient.

KvantPhone: secure peer-to-peer communication with end-to-end post-quantum encryption
10+ Tech awards Tech
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15+ Years in secure software development Years in secure
development
20+ Security assessments passed Security
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100+ Countries with users Countries
with users

For cases that shouldn’t be discussed over the phone

For cases that shouldn’t be discussed over the phone

KvantPhone is designed to prevent interception and surveillance for the conversations you cannot afford to expose.

Form factor: a mobile application for iOS and Android — similar to Signal, but built for high-risk environments without compromise.

KvantPhone on iOS and Android

No backdoor of any kind — guaranteed

Not even KvantPhone’s developers can access private data or decrypt your communication.

Built-in quantum resistance in all features

Every channel inside KvantPhone — voice, messaging, conferencing, files — is protected by the same post-quantum cryptography.

Secure messaging

Secure messaging

Secure, encrypted messaging is a standard feature of KvantPhone.

Encrypted confcalls

Encrypted confcalls

KvantPhone features secure conference calling between multiple KvantPhone users.

Secure group chat

Secure group chat

Message communication in groups also includes broadcast messaging.

Secure file sending

Secure file sending

KvantPhone’s feature set also includes secure and encrypted file sending.

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Designed for businesses and large organizations

Six advantages KvantPhone brings to organizations that take communication security seriously.

Convenience and discretion

Use it without drawing attention — communication that blends into your daily workflow.

Set-up in minutes & easy to use

No special hardware, no lengthy onboarding — install, activate, and start communicating securely.

Regular security audits

Independent verifications keep the security posture honest and transparent.

Totally secure calls and messages

End-to-end encrypted voice and text — no intermediaries can listen in or read along.

Secure conference calling

Multi-party encrypted calls between KvantPhone users with the same security guarantees.

Best-practice cryptography

Quantum-resistant cryptography prepared for harvest-now-decrypt-later threats.

Ready to make your communication secure?

Guard against eavesdroppers with KvantPhone’s maximally reliable and secure communication service.

Visit KvantPhone's website

The Solution for the B2G & Defence sector

The Solution for the B2G & Defence sector

We understand the needs of government and defence organizations — and we build for them.

  • State-of-the-art security with regular updates
  • Management and admin features for any organization structure and complexity
  • Special feature requirements covered, including hidden sites and SOC integration
  • White-labelling and bespoke feature development options
  • Regular product audits — open for audit by the customer
  • Company transparency as a core operating principle
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Soldier in tactical gear using a secure mobile phone

Ready to make your communication secure?

Guard against eavesdroppers with KvantPhone’s maximally reliable and secure communication service.