Deep Dive Series
Getting Started With Quantum Security & PQC Migration
Post-quantum migration is not a patch cycle. It is the largest, most complex cryptographic overhaul most organizations will ever face — touching every system, every vendor, every protocol, and every assumption about how digital trust actually works. The challenge is not picking an algorithm. It is building the program: securing the mandate, finding the cryptography, documenting it, prioritizing what matters, and then migrating without breaking the business.
This Deep Dive series is a practitioner’s roadmap for that journey — organized along the lifecycle most teams actually follow. From boardroom business cases and budget justification, through cryptographic discovery and CBOM construction, to hybrid pilots, infrastructure hardening, and vendor governance, each phase links to detailed, opinionated guidance drawn from real-world PQC migration programs. The articles are designed to be read in sequence as laid out in the companion guide, or dipped into individually wherever your organization is today.
-
Your complete roadmap to quantum-proofing your organization — from boardroom mandate to operational crypto-agility. This practitioner-curated Deep Dive series collects the PostQuantum.com articles you need to launch and run a quantum-readiness program, organized along the lifecycle most teams actually follow: securing executive buy-in and budget, performing cryptographic discovery and inventory, building a Cryptographic Bill of Materials (CBOM), scoring and prioritizing risk, standing up governance and a realistic multi-year roadmap, running hybrid and PQC pilots, hardening infrastructure for post-quantum performance impacts, and managing vendors and supply chains through the transition. Whether you're a CISO building a business case, a program manager calibrating scale, or a technical lead planning your first pilot, each phase links to detailed, opinionated guidance drawn from real-world PQC migration programs. Start with the comprehensive step-by-step guide at the top, then drill into the phase-by-phase articles that match where your organization is today. This is a living resource — updated as standards, tooling, and lessons learned evolve.
Read More »
-
Post-Quantum, PQC, Quantum Security
Harvest Now, Decrypt Later (HNDL) Risk
"Harvest Now, Decrypt Later" (HNDL), also known as "Store Now, Decrypt Later" (SNDL), is a concerning risk where adversaries collect encrypted data with the intent to decrypt it once quantum computing becomes capable of breaking current encryption methods. This is the quantum computing's ticking time bomb, with potential implications for every encrypted byte of data currently considered secure.
Read More » -
Post-Quantum, PQC, Quantum Security
Post-Quantum Cryptography (PQC) and Network Connectivity: Challenges and Impacts
PQC brings new dependencies between cryptography and network connectivity. Unlike the relatively small and efficient crypto of the past, post-quantum algorithms force us to consider link capacity, latency, and device limitations as first-class concerns in security design. Some network environments - particularly low-power and low-bandwidth links - will face significant challenges in a post-quantum migration, potentially impacting communication reliability. Other environments, like typical broadband and…
Read More » -
Post-Quantum, PQC, Quantum Security
Cryptographic Stack in Modern Interbank Payment Systems
International interbank payments rely on multiple layers of classical cryptography to ensure security from end to end. When a user initiates a cross-border transfer at their local bank, cryptographic mechanisms protect the transaction at every stage - from the customer’s online banking session, through the bank’s internal systems, across the SWIFT interbank messaging network, to settlement in a central Real-Time Gross Settlement (RTGS) system.
Read More » -
Post-Quantum, PQC, Quantum Security
Upgrading Operational Technology (OT) Systems to Post‑Quantum Cryptography (PQC): Challenges and Strategies
Operational Technology (OT) environments, such as industrial control systems and critical infrastructure, are especially at risk due to their long-lived devices and infrequent updates. Many OT systems deployed today will still be in use a decade or two from now, well within the timeframe experts anticipate quantum attacks to become practical. The most critical OT systems will likely be the last to become quantum safe…
Read More » -
Quantum Computing
The Skill Stack a CISO Needs for Crypto‑Agility and Quantum Readiness
The path to quantum readiness is navigable with the right combination of skills, planning, and proactive execution. By leveraging existing strengths - the people and processes you already have - an enterprise can evolve its cryptographic foundations without needing a phD in quantum physics on staff. In fact, quantum-proofing your organization is less about radical new technology and more about disciplined security management: inventory your…
Read More » -
Post-Quantum, PQC, Quantum Security
Rethinking Crypto-Agility
At its core, crypto-agility means being able to swiftly swap out cryptographic algorithms or implementations when weaknesses emerge. In an ideal world, an organization could “drop in” a new encryption algorithm as easily as a software patch, ensuring they stay ahead of threats like quantum computing. The goal is admirable - if you’re nimble in updating encryption, migrating to stronger algorithms is “no big deal”.…
Read More » -
Post-Quantum, PQC, Quantum Security
Telecom’s Quantum‑Safe Imperative: Challenges in Adopting Post‑Quantum Cryptography
The race is on to quantum‑proof the world’s telecom networks. With cryptographically relevant quantum computers (CRQC) projected to arrive by the 2030s, global communications providers face an urgent mandate to upgrade their security foundations. Today’s mobile and fixed‑line networks rely on public-key cryptography that quantum algorithms could eventually break. In response, the telecom industry is turning to post-quantum cryptography (PQC) as the primary defense. Yet…
Read More » -
Post-Quantum, PQC, Quantum Security
Infrastructure Challenges of “Dropping In” Post-Quantum Cryptography (PQC)
Post-quantum cryptography (PQC) is moving from theory to practice. NIST has now standardized several PQC algorithms - such as CRYSTALS-Kyber for key exchange (now known as ML-KEM) and CRYSTALS-Dilithium and SPHINCS+ for digital signatures - and major tech companies like Google, AWS, and Cloudflare have begun experimenting with integrating these algorithms. On the surface, it may seem that we can simply “drop in” PQC algorithms…
Read More » -
Post-Quantum, PQC, Quantum Security
How to Perform a Comprehensive Quantum Readiness Cryptographic Inventory
A cryptographic inventory is essentially a complete map of all cryptography used in an organization’s systems – and it is vital for understanding quantum-vulnerable assets and planning remediation. In theory it sounds straightforward: “list all your cryptography.” In practice, however, building a full cryptographic inventory is an extremely complex, lengthy endeavor. Many enterprises find that even identifying all their IT assets is challenging, let alone…
Read More » -
Post-Quantum, PQC, Quantum Security
Cryptographic Bill of Materials (CBOM) Deep-Dive
Cryptographic Bill of Materials (CBOM) represent the next evolution in software transparency and security risk management. As we have explored, a CBOM provides deep visibility into an application’s cryptographic underpinnings – an area that has often been opaque to security teams. By enumerating algorithms, keys, certificates, and their usage, CBOMs empower organizations to tackle challenges ranging from quantum cryptography transition and legacy crypto cleanup to…
Read More » -
Post-Quantum, PQC, Quantum Security
Hybrid Cryptography for the Post-Quantum Era
By combining classical and post-quantum cryptographic primitives in tandem, hybrid schemes provide defense-in-depth during this transition period. In practice, a hybrid approach might mean performing both a traditional elliptic-curve key exchange and a post-quantum key exchange inside the same protocol, or signing a document with both an ECDSA signature and a Dilithium (post-quantum) signature. The result is that an attacker would need to break all…
Read More » -
Post-Quantum, PQC, Quantum Security
PQC Is Necessary, But Not Sufficient – Building Quantum Resilience the Right Way
Simply "dropping in" PQC algorithms will not magically make systems quantum-safe. Real security hinges on how these new primitives are implemented, integrated, and layered into our systems. A quantum-resistant algorithm on paper can still fail in practice due to coding bugs, side-channel leaks, protocol limitations, or misuse within a larger insecure design. In short: PQC is necessary but not sufficient. It must be one pillar…
Read More » -
Post-Quantum, PQC, Quantum Security
Quantum Readiness Assessment (QRA)
A Quantum Readiness Assessment (QRA) is an in-depth review of an organization’s preparedness for the advent of quantum computing - especially its ability to withstand or adapt to the "quantum threat" posed by quantum computers that could render current cryptography obsolete. In practical terms, a QRA examines how an organization’s systems, data, and processes would hold up if cryptographically relevant quantum computers were available today.…
Read More » -
Post-Quantum, PQC, Quantum Security
Cryptographic Inventory Vendors and Methodologies
Achieving a comprehensive cryptographic inventory often requires combining multiple tools and methodologies. Each solution above has blind spots: one might excel at catching code-level issues but miss network usage, another might see network traffic but miss dormant code, etc. Organizations starting a crypto inventory (especially as part of PQC readiness) should evaluate these tools in terms of their environment: for example, pairing a passive network…
Read More » -
Post-Quantum, PQC, Quantum Security
Quantum Readiness / PQC Migration Is The Largest, Most Complex IT/OT Overhaul Ever – So Why Wait?
Preparing for the quantum era is arguably the largest and most complicated digital infrastructure overhaul in history. Yes, far bigger than Y2K, because back in 1999 we didn’t have millions of network-connected “things” to worry about. Yet despite clear warnings and rapidly approaching milestones, far too many organizations still treat quantum readiness as something to punt into next year – or worse, as a simple…
Read More »
