QCS (Quantum Computing Solutions)

QCS, or Quantum Computing Solutions, develops post-quantum cryptography tools for protecting files against threats posed by future quantum computers. The company's core product is Q-Files, a web-based SDK that allows users to encrypt, decrypt, and inspect files using a proprietary .qtm file format, which incorporates hybrid post-quantum cryptographic algorithms. The Q-Files platform includes modules for key management (activating and deactivating public keys while preserving the ability to decrypt older files), key generation (creating bundles of public/private QTM keys), and recipient pools that allow multi-recipient encryption for teams or organizations. Users can encrypt a single file for multiple recipients, and the platform supports local verification and inspection of file metadata (TLV) and signature blocks directly in the browser, without dependence on external services. QCS positions its technology as sovereign and verifiable, targeting sectors facing regulatory requirements around data protection and cryptographic transition. The company has published a whitepaper detailing the .QTM file format, its cryptographic model, threat model, and use cases in regulated industries. The company is based in Spain, with ties to Valencia's technology ecosystem, and lists partnerships with organizations including the Universitat Politècnica de València (UPV), INCIBE (Spain's national cybersecurity institute), Startup Valencia, ETSI, and ICEX. QCS describes its core technology as open source and is active in European cybersecurity and technology events related to quantum computing and post-quantum cryptography migration.