We are in 2026, and the conversation around quantum computing has moved beyond science fiction to become an increasingly tangible operational risk. However, many organizations still assume that preparing for Q-Day is simply a matter of updating software.
Gartner’s latest report, “4 Steps Toward Postquantum Readiness,” challenges this assumption: the real challenge is not technological—it is organizational. And most companies still lack the governance model required to address it.
The end of the false sense of encryption security
For decades, organizations have operated under a convenient assumption: that encrypted traffic represents an almost absolute zone of security.
It has been widely assumed that once critical data entered a VPN tunnel or moved between cloud environments during backup processes, it remained permanently protected. But this “immunity” has an expiration date.
The reason lies in a growing strategy within post-quantum security: “Harvest Now, Decrypt Later.”
According to Gartner, malicious actors are already capturing large volumes of encrypted data today, with the intention of decrypting it in the future once sufficient quantum computing power becomes available.
The problem is that this vulnerability is silent and often buried within legacy systems. And this is where an uncomfortable truth emerges for many organizations: you cannot protect what you do not know you have.
Cryptographic inventory: the first step toward post-quantum security
To address this risk, Gartner recommends a fundamental first step: building a comprehensive cryptographic inventory.
This inventory should classify assets into three main categories:
- Vendor products and solutions
- Internally developed applications
- Cryptographic debt in legacy systems, such as platforms still using outdated algorithms like DES or MD2
Without this level of visibility, any migration plan toward post-quantum algorithms is likely to result in increased costs, improvisation—or outright failure.
Cryptographic agility: the capability that will define resilience
A lack of visibility creates technical debt that forces organizations to adopt what analysts refer to as “Cryptographic Agility by Design.”
This is not just about selecting the “winning” algorithm today. It is about designing infrastructures that can adapt cryptographic mechanisms in a modular way—without breaking applications or critical processes.
If an organization needs months to update a simple encryption library, the problem is not quantum computing. The problem is an overly rigid operating model.
The quantum transition is also a third-party challenge
The challenge of quantum security does not end within the organization itself.
Gartner emphasizes that no transition will be successful without rigorous management of the vendor and third-party ecosystem. This makes areas such as procurement and purchasing strategic players in Q-Day readiness.
It is no longer enough to rely on commercial promises. Organizations must demand:
- Transparency regarding the algorithms being used
- Clear roadmaps toward post-quantum cryptography
- Verifiable contractual commitments
In other words, trust is no longer a blank check—it becomes an auditable requirement.
Preparing for Q-Day: a matter of organizational maturity
Preparing for the quantum era is, ultimately, a test of organizational maturity.
For this reason, Gartner recommends establishing a Cryptographic Center of Excellence (CCoE) to centralize policies, standards, and decision-making. This model helps break down traditional silos between:
- Development teams
- Operations
- Security
- Risk management
Quantum computing may represent a future threat. But cryptographic disorganization is a present vulnerability.
Organizations that succeed in transforming cryptographic management into an agile and governed process will not only be better prepared for Q-Day—they will also build a far more resilient security architecture for whatever technological challenges come next.
Want to learn what Gartner says about Q-Day? Download “4 Steps Toward Postquantum Readiness” here.
