Quantum computing will break current asymmetric cryptography — the same cryptography protecting blockchain key pairs, TLS sessions, VPN tunnels, and digital signatures. Xenqube designs and implements cryptographic resilience: post-quantum migration, key management architecture, and hybrid encryption for systems that need to be secure today and quantum-resistant tomorrow.
Current asymmetric cryptography — RSA, ECDSA, Diffie-Hellman — relies on the computational hardness of factoring large integers and solving discrete logarithm problems. Sufficiently powerful quantum computers running Shor's algorithm will solve these problems efficiently. The timeline is debated, but NIST has already standardised post-quantum algorithms and regulators in financial services and government are requiring migration plans now.
ECDSA key pairs securing blockchain wallets, validator signatures, and cross-chain bridge authorisation are vulnerable. Harvest-now-decrypt-later attacks mean adversaries collecting signed transactions today can decrypt them when quantum capability arrives.
TLS sessions, VPN tunnels, PKI certificate chains, digital signature workflows, and data-at-rest encryption using RSA or elliptic curve keys face the same risk on longer time horizons.
NIST finalised the first post-quantum cryptography standards in 2024. Financial regulators and government agencies in the US, EU, and UK are requiring organisations to develop and execute PQC migration plans with defined timelines.
Xenqube applies the NIST-standardised post-quantum algorithms across Web3 infrastructure, enterprise security systems, and hybrid environments. Implementation is structured to be both quantum-resistant and backward-compatible during the transition period.
Lattice-based key encapsulation mechanism standardised by NIST. Used for key exchange in TLS, VPN protocols, and secure channel establishment. Deployed in hybrid mode alongside classical ECDH during migration periods to maintain compatibility.
Lattice-based digital signature algorithm for authentication, code signing, certificate issuance, and transaction authorisation. Replaces ECDSA for systems requiring long-term signature validity or quantum-resistant non-repudiation.
Hash-based signature scheme with conservative security assumptions. Used for firmware signing, certificate authorities, and long-lived signatures where key security must be maintained for decades.
Combining classical and post-quantum algorithms in a single handshake — if either algorithm remains secure, the session is secure. Standard migration pattern for TLS, VPN, and key exchange systems that cannot accept downgrade risk.
Cryptographic resilience depends as much on key management discipline as algorithm selection. Xenqube designs key management architectures that eliminate single points of compromise, enforce separation of duty, and support key rotation without operational disruption.
A complete PQC migration engagement covers inventory, risk prioritisation, algorithm selection, implementation, and validation — not a single algorithm swap applied without architectural context.
Identify all cryptographic dependencies across your stack: key types, algorithms, libraries, certificate chains, and dependent systems. Build the migration dependency graph before any implementation starts.
Score each cryptographic dependency by exposure risk and migration complexity. High-value, long-lived keys and publicly-visible signed data are migrated first. Define a staged rollout that eliminates critical risk without disrupting operations.
Implement PQC algorithms using vetted libraries (liboqs, BouncyCastle PQC, OpenSSL with PQC extensions). Validate correctness through interoperability testing, performance benchmarking, and security review of the migration implementation itself.
Share your current cryptographic architecture and timeline constraints. We will assess your exposure and define a practical migration path.
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