Silentel

What Silentel does

Silentel is a secure mobile communication platform developed and operated by Slovak joint-stock company Ardaco, a.s., headquartered in Bratislava. The platform provides end-to-end encrypted voice calls, messaging, group chat, conference calls, and file transfer across iOS, Android, macOS, and Windows devices, with an on-premise Silentel Server that never holds decryption keys. Its architecture relies on device-to-device encryption with one-time keys destroyed after each communication, no permanent data storage on user devices, and Elliptic Curve Cryptography for key exchange. The product suite comprises the core Silentel application, SilentelSafe for AES-256 encrypted on-device file storage, Silentel Studio for centralized user/administrator management, and the parent's QSign qualified electronic signature line.

The company sells into three segments: government and military organizations requiring NATO-approved classified communications (up to RESTRICTED and CONFIDENTIAL levels), enterprises needing full organizational control over their communication infrastructure, and individual privacy-conscious consumers. It has been certified by National Security Agencies since 2006 — including Slovakia's NBÚ and Bulgaria's State Agency for National Security — and was the first worldwide secure mobile communication solution listed in the NATO Information Assurance Products Catalogue (NIAPC). Named deployments include Bulgarian government agencies, NATO civil and military bodies, and the 2016 Slovak EU Presidency.

The business operates a dual GTM model: enterprise and government customers are reached through direct sales with contact-form-driven demos and quote-based multi-year contracts, while individual consumers download directly from iOS App Store, Google Play, and Windows PC stores on subscription terms. Distribution spans more than 50 countries. The company is privately held with no disclosed funding rounds, parent company, or external investors, and is supported by personnel with NATO and EU security clearances.

Name

Silentel

Legal name

Ardaco, a.s.

Website

https://silentel.com

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

11–50 employees

Short description

Silentel, developed by Bratislava-based Ardaco, a.s., provides NATO-approved end-to-end encrypted mobile voice, messaging, conference, and file-transfer communication to government, military, enterprise, and individual customers across more than 50 countries.

Ownership category

akta.pro rank

Product category

Secure Communications Software

NAICS

Software Publishers (5132)

SIC

Services-Prepackaged Software (7372)

akta.pro primary industry

Secure/Encrypted Messaging (BPAMACAG)

akta.pro secondary industry

Identity & Access Security Services (IAM, PAM, Zero Trust) (BPAKAHAI)

Keywords

• Secure mobile communication
• Encrypted voice calls
• NATO certified encryption
• Classified messaging platform
• Device-to-device encryption

Headquarters

HQ city

Bratislava

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Personnel, Marketing or Sales, Operations, Infrastructure

Revenue model

1. Silentel Secure Communication Platform: Licensing of the Silentel secure mobile communication platform (client apps, server modules, user management) to government organizations, enterprises, and individuals. Subscription or perpetual licensing model.
2. QSign Electronic Signature Products: Ardaco provides a full range of proprietary products for qualified electronic signature – QSign – enabling secure and cost-effective handling of electronic documents.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels3 records

Core offering

Silentel is a NATO-approved, multi-platform secure mobile communication suite providing device-to-device encrypted voice calls, messaging, secure group chat, secure conference calls, and file transfer for iOS, Android, macOS, and Windows PC. The platform includes on-premise Silentel Server infrastructure, the SilentelSafe AES-256 encrypted file storage module, and the Silentel Studio web-based administration console. It is sold to government, military, and enterprise customers on multi-year contracts and to individual consumers via direct app-store subscription.

Product overview

Silentel is a multi-platform secure communication suite developed by Ardaco, consisting of the core Silentel application for encrypted voice, messaging, and file transfer, complemented by SilentelSafe for encrypted file storage and Silentel Studio for enterprise administration. The system architecture separates the client applications (iOS, Android, macOS, Windows PC) from the Silentel Server infrastructure, which operates on-premise under full organizational control without access to encryption keys. The platform is designed for government, enterprise, and individual users requiring NATO-certified secure communications.

Differentiator

Problem solved

Functional benefit

Brands

• Silentel: Secure mobile communication platform providing voice calls, messaging, conference calls, and file transfer with device-to-device encryption.
• SilentelSafe
• Silentel Studio
• QSign

Products and services

• Silentel (Secure Mobile Communication Platform) A NATO-approved secure mobile communication application providing device-to-device encrypted voice calls, secure messaging, secure group chat, secure conference calls, and secure file transfer across iOS, Android, macOS, and Windows PC. Sold to government, military, enterprise, and individual customers.
• SilentelSafe (Encrypted File Storage) Secure local file storage module that protects sensitive documents, photos, and files using AES-256 encryption bound to the user's mobile device and password, with no third-party servers or cloud services involved. Targeted at individuals and organizations that need to keep stored files unreadable to anyone but the device owner.
• Silentel Studio (Administration Console) Web-based administration console for managing Silentel users, contact lists, separate communication groups, and usage statistics (exportable to XLSX), with multi-role administrator capabilities. Used by enterprise and government customers to centrally manage their on-premise Silentel deployments.
• Silentel Server (On-Premise Communication Infrastructure) On-premise communication server infrastructure that manages user authentication, message routing, and conference coordination while never having access to encryption keys or message content. Deployed by enterprise and government customers for full operational control with no third-party decryption capability.
• QSign (Qualified Electronic Signature Products) Ardaco's proprietary product line for qualified electronic signatures — enabling secure and cost-effective handling of electronic documents. Distributed via the same parent organization (Ardaco, a.s.) alongside the Silentel platform on a subscription basis.

Quantifiable outcome

• Zero incidents of Pegasus or similar software infiltrating Silentel (as reported by the company)
• +1 more outcomes

Named customers4 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration8 records

Feature12 records

Partnerships

One partnership is on record.

• Slovak EU PresidencycoreStrategic or Co-development Partner · 1 July 2016Silentel was a partner of the Slovak EU Presidency in the second half of 2016, providing secure mobile communication for top official representatives of the EU Presidency.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Cellcrypt: Cellcrypt provides certified secure voice and messaging solutions for government, military, and law enforcement. It is a direct peer to Silentel in the NATO-grade secure mobile voice and messaging niche.
• Wickr (Amazon): Wickr is an end-to-end encrypted collaboration platform now owned by Amazon, serving government, defense, and enterprise with secure messaging, voice and file transfer. It competes head-on with Silentel for secure mobile communication contracts in defense and public-sector procurement.
• Element (Matrix): Element is the flagship client for the open Matrix protocol, offering decentralized E2E-encrypted messaging, voice and video. It competes with Silentel among governments and enterprises seeking sovereign, federated secure communications.
• Wire: Wire is an E2E-encrypted messaging, voice and conferencing platform built on open-source, with strong adoption among enterprises and governments. It directly competes with Silentel in secure team collaboration and certified communication offerings.
• Signal: Signal is a widely adopted open-source end-to-end encrypted messenger for voice, messaging and video. It competes with Silentel in the core secure-communication category, though it focuses on consumers and prosumers rather than NATO-certified government deployment.
• Threema: Threema is a Switzerland-based encrypted messenger offering E2E voice, messaging and file transfer for business and government, with on-premise options comparable to Silentel. Both target European enterprises and regulated customers that need data sovereignty.

Broad incumbents

• BlackBerry SecuSuite: BlackBerry SecuSuite is a broader secure-communications portfolio offering encrypted voice, messaging and data for governments and regulated enterprises. It overlaps with Silentel's certified secure mobile communication offering as part of a much larger enterprise software portfolio.
• Secunet: Secunet is a German provider of high-grade IT security, including SINA-approved secure communications for government and defense. It is a broader incumbent in NATO-grade secure mobile communications comparable to Silentel's offerings.
• Sectra Communications: Sectra provides encrypted communications solutions for European defense and government customers, including secure mobile voice and messaging. It is a Nordic/NATO-aligned peer with comparable certified government focus to Silentel.

Emerging players

• KoolSpan: KoolSpan provides encrypted mobile voice and messaging for enterprises and governments, with secure call and messaging apps. It is a smaller emerging peer operating in the same certified-secure-mobile-communication category as Silentel.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Silentel