Engineering a crypto-agile abstraction layer to migrate a high-growth Neobank to NIST-standard post-quantum algorithms—eliminating 'Harvest Now, Decrypt Later' risks without service interruption.
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High-velocity banking core managing $2B+ in assets requiring sovereign cryptographic protection.
Security Architect + 2 Cryptography Engineers + DevSecOps Lead embedded within the Core Infrastructure unit.
Moving from static RSA/ECC dependencies to a modular, post-quantum ready key management system (KMS).
NIST ML-KEM (Kyber) and ML-DSA (Dilithium) implementations alongside legacy HSM anchors.
The client’s Series-C banking core was built on standard Elliptic Curve Cryptography (ECC). While currently secure, these algorithms are structurally vulnerable to emerging Shor’s algorithm-based quantum attacks, exposing them to 'Harvest Now, Decrypt Later' (HNDL) threats.
The architectural debt was significant: cryptographic primitives were hard-coded into the banking logic, making an algorithm swap a high-risk, multi-month operation. The neobank required a transition to 'Crypto-Agility' to satisfy looming NIST standards and institutional investor mandates.
Hard-coded ECC required manual refactoring of microservices to change security primitives.
New algorithms (Kyber/Dilithium) are deployed via a central orchestration layer with zero code changes.
Subject to HNDL risks and future-obsolescence of current signature schemes.
Hybrid-mode encryption ensures immediate post-quantum security without breaking legacy support.
Required core service restarts and significant downtime for key database re-encryption.
K8s-native rolling updates with concurrent key-version support ensured 100% uptime.
Injected hand-optimized assembly code for NIST algorithms to minimize the auth overhead on mobile devices.
Ensured post-quantum entropy is sourced from FIPS 140-3 Level 3 hardware security modules.
Every transactional signature now carries a version metadata tag, allowing for deterministic historical auditing.
Standardized Golang and Rust wrappers for NIST algorithms, pre-audited for constant-time execution.
Production-ready gRPC middleware for dynamic algorithm selection and hybrid signature logic.
Real-time monitoring of random number generation quality and key health metrics.
Resource monitoring to ensure post-quantum compute overhead doesn't spike cloud egress costs.
Successfully transitioned 100% of core auth services to NIST-standard post-quantum primitives.
Maintained sub-5ms overhead even with complex post-quantum hybrid signatures.
Execution of the rotation policy across all digital assets without a single customer logout event.
Client Testimonial
Coretus didn't just patch our security; they future-proofed our sovereignty. We are the first Series-C neobank to achieve NIST-standard post-quantum readiness with zero impact on our user experience or transaction speed.
Chief Technology Officer
Replace legacy algorithm debt with NIST-standard post-quantum resilience. We engineer crypto-agile meshes that secure your assets against 'Harvest Now, Decrypt Later' risks with zero downtime.
NIST FIPS 203/204 Ready
Zero-Downtime Migration
100% IP & Model Ownership