QCS Post-Quantum Secure Backup (.qtm)

QCS Post-Quantum Secure Backup is built around the .qtm file format, a container format designed to encapsulate file content, post-quantum cryptographic signatures, key exchange data, and access/audit policies into a single archive that can be verified offline without external services. The format uses NIST-standardized post-quantum algorithms: Kyber (ML-KEM) for key exchange and Dilithium (ML-DSA) for digital signatures, aiming to protect archived documents against future quantum computing attacks, including "harvest now, decrypt later" scenarios where encrypted data captured today could be decrypted once quantum computers become capable. Each .qtm file embeds access control, traceability, and retention policies within the container itself, and is designed to work in air-gapped or offline environments without vendor dependency. The product targets long-term document archiving needs (10-30 years) in regulated sectors such as legal (contracts, notarial records), healthcare (medical records, hospital backups), finance (audit and transaction records), and public administration (citizen files). QCS provides an SDK for integration via API or CLI, supporting on-premises and air-gapped deployment, from proof-of-concept to production. The company positions the offering as EU-based, GDPR-native, and aligned with regulatory frameworks including NIS2, ENS, DORA, and eIDAS2. The architecture is described as open-core, intended to avoid vendor lock-in and allow independent security verification. QCS also offers related services including a Crypto-Audit Express (quantum risk assessment), API & Endpoint Protection, and PQC training and education.