Post-Quantum Encrypted Voice, Messaging, and File Transfer

Cellcrypt is a secure communications company founded in 2005 and headquartered in London. Its customers are government agencies, defense contractors, and large enterprises that need calls, messages, and file exchanges to stay confidential outside of classified networks. The company positions its platform for users operating on ordinary mobile devices and commercial carrier networks, where traffic can be observed in transit, rather than requiring purpose-built handsets or a dedicated radio infrastructure to get confidentiality.

The platform encrypts voice, video, group messaging, and file transfer end to end, and layers post-quantum algorithms over conventional cryptography so that traffic captured today cannot be decrypted later once quantum computers mature, the pattern usually described as harvest now, decrypt later. A zero-knowledge architecture limits what the service itself can see, including metadata about who contacted whom. The codec and transport are tuned to keep calls usable on low-bandwidth and unreliable links.

Cellcrypt sells a cloud-hosted Enterprise tier priced per user per month, an on-premises edition that customers run on their own infrastructure including fully air-gapped networks, and a Voice Gateway that connects encrypted mobile users to existing PBX systems and desk phones. Hosted infrastructure sits in Switzerland. The product holds a Common Criteria EAL4+ evaluation and FIPS 140-3 Level 2 validation, and is listed in the NATO Information Assurance Product Catalogue.