Introduction
When most people hear quantum computing, they picture something from the distant future, a technology so advanced and experimental that it barely registers as a practical concern.
The reality in 2026 is far more unsettling.
While a fully cryptographically relevant quantum computer may not exist yet, the attack it will eventually enable has, in many cases, already begun. Threat actors are preparing for a future where today’s encryption can be broken, and organisations that fail to prepare may find their most sensitive information exposed years after it was originally transmitted.
This isn’t a problem for tomorrow. It’s a cybersecurity challenge businesses need to start addressing today.
What Makes Quantum Computers So Threatening to Cybersecurity?
Modern cybersecurity relies heavily on encryption.
From online banking and cloud applications to confidential emails and financial transactions, sensitive information is protected by cryptographic algorithms built on mathematical problems that are practically impossible for conventional computers to solve.
For example:
- Factoring extremely large numbers
- Solving discrete logarithm problems
- Breaking public-key cryptography schemes
Using today’s computing power, these tasks would take millions of years.
A sufficiently powerful quantum computer, however, could solve many of these problems dramatically faster. As a result, widely used encryption standards such as RSA and other public-key cryptographic systems could become vulnerable.
In simple terms, much of the cryptographic foundation that secures the internet today would no longer provide the same level of protection.
The Harvest Now, Decrypt Later Problem
The most urgent aspect of the quantum threat is not necessarily what happens when quantum computers arrive.
It’s what is happening right now.
Security experts widely believe that nation-state actors and sophisticated cyber criminal groups are already conducting “harvest now, decrypt later” operations.
The strategy is straightforward:
- Intercept encrypted data today.
- Store it for future use.
- Decrypt it once quantum computing capabilities become sufficiently advanced.
This creates a serious long-term risk for organisations handling sensitive information.
Consider the types of data being transmitted and stored today:
- Confidential business communications
- Intellectual property
- Financial records
- Healthcare information
- Government data
- Legal contracts
- Customer records
If attackers are collecting this information now, they may be able to access it years later once quantum-powered decryption becomes practical.
For industries where data must remain confidential for long periods, this is not a theoretical concern—it is an active and ongoing risk.
Where Things Stand in 2026
Quantum computing technology continues to advance at a rapid pace.
While researchers have not yet achieved a quantum computer capable of breaking current encryption at scale, progress is accelerating across both public and private sectors.
The challenge is that cryptographic migrations take years to complete.
Large organisations often rely on thousands of applications, systems, devices, and third-party services that use encryption in different ways. Transitioning those environments to new cryptographic standards cannot happen overnight.
Waiting until a quantum breakthrough occurs may leave organisations scrambling to replace critical infrastructure under significant pressure.
Fortunately, the cybersecurity community has been preparing for this transition for years.
The Rise of Post-Quantum Cryptography
To address the coming threat, the cybersecurity industry has been developing post-quantum cryptography (PQC), encryption algorithms specifically designed to resist attacks from quantum computers.
These algorithms aim to provide security against both:
- Classical computers
- Future quantum computers
The publication of post-quantum cryptographic standards has given organisations a practical roadmap for modernising their security infrastructure.
Forward-thinking businesses are already beginning the transition process, recognising that cryptographic agility and long-term planning are essential to future resilience.
What Businesses Should Be Doing Now
You do not need a team of quantum physicists to start preparing.
There are several practical steps every organisation can take today.
1. Conduct a Cryptographic Audit
The first step is understanding where encryption is being used across your organisation.
Identify:
- Encryption protocols
- Security certificates
- VPN technologies
- Authentication systems
- Cloud security controls
You cannot modernise what you have not mapped.
2. Identify Long-Lived Data
Not all information requires decades of confidentiality.
Focus on data that must remain protected for years or longer, including:
- Intellectual property
- Strategic business plans
- Legal agreements
- Customer records
- Healthcare information
- Financial documentation
This information is most vulnerable to harvest now, decrypt later attacks.
3. Follow Post-Quantum Migration Guidance
Industry standards and guidance provide a clear framework for organisations planning their transition.
Rather than waiting for urgency, businesses should begin evaluating:
- Post-quantum encryption options
- Migration timelines
- Cryptographic dependencies
- Upgrade requirements
Early planning significantly reduces future disruption.
4. Engage Your Vendors and Service Providers
Your cybersecurity posture depends on more than your internal systems.
Cloud providers, software vendors, telecommunications partners, and managed service providers all rely on encryption technologies.
Ask suppliers:
- What is your post-quantum roadmap?
- Which systems will be upgraded first?
- How will customers be supported during migration?
- What timelines are being considered?
Third-party readiness should form part of your broader risk management strategy.
5. Integrate Quantum Readiness Into Existing Security Programmes
Quantum preparedness should not exist in isolation.
Instead, it should be incorporated into:
- Enterprise risk management
- Cybersecurity strategy
- Compliance programmes
- Data governance initiatives
- Vendor risk assessments
Treating quantum readiness as part of overall cyber resilience helps ensure it receives the attention it requires.
Why Early Preparation Matters
One of the biggest misconceptions surrounding quantum computing is that organisations can wait until the technology fully matures before taking action.
In reality, organisations that begin preparing now gain several advantages:
- Reduced migration complexity
- Better visibility into cryptographic assets
- Improved regulatory readiness
- Lower long-term costs
- Stronger protection against future threats
Cybersecurity has always been about anticipating risk before it materialises. Quantum computing simply requires a longer planning horizon than most organisations are accustomed to.
The Bottom Line
The quantum threat may feel distant, but the risks associated with harvest now, decrypt later strategies are already present today.
Data being transmitted, stored, and protected right now may eventually become accessible if organisations fail to modernise their cryptographic foundations.
Businesses that begin planning their post-quantum migration early will be significantly better positioned than those that delay until urgency forces action.
The transition to quantum-safe security is not merely a technology upgrade, it is a strategic investment in the long-term protection of your organisation’s most valuable information.
Is Your Organisation Quantum Ready?
Understanding your exposure to future cryptographic risks starts with visibility.
Our team can help you:
- Assess your current cryptographic landscape
- Identify vulnerable encryption dependencies
- Evaluate quantum-related risks
- Develop a post-quantum migration roadmap
- Build a long-term quantum-safe security strategy
Talk to our Prosecure experts today and start building a future-proof cybersecurity framework that protects your organisation well beyond the quantum era.