Digital communication in the post-quantum era

Your data could be decrypted in the future. Prepare for the post-quantum era now.

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Why it matters now

Quantum computers don't need to exist yet to threaten your data. Attackers can intercept it today and decrypt it in the future.

Harvest Now, Decrypt Later

Data encrypted with classical algorithms and intercepted today could be decrypted in a few years when a quantum computer capable of breaking encryption becomes available.

Data longevity

If your data needs to remain protected for 5–20 years, classical cryptography will no longer be sufficient. The risk grows every year.

Loss of trust in signatures

Digital signatures based on RSA/ECC may lose credibility. This means a risk of undermining the validity of documents and transactions.

Migration takes years

Large organizations need 3–7 years to transition to post-quantum cryptography. Delaying decisions increases risk and costs.

Who needs post-quantum security?

The most at-risk organizations are those that store data for years and rely on trust in digital signatures, encryption, and online communication.

Finance and insurance

Transactions, contracts, customer data and operation histories must remain confidential and legally binding for years. Loss of trust in signatures is a real regulatory risk.

Public administration and registries

Registries, e-services and official documents have a time horizon measured in decades. A "harvest now, decrypt later" attack directly undermines the state's credibility.

Healthcare, legal and sensitive data

Medical records, case files, expert opinions and personal data have long-term value and are especially attractive to attackers.

Technology, SaaS and critical infrastructure

Cloud platforms, digital service providers and critical system operators must think about security 5–10 years ahead.

Don't see your industry, but you process long-lived data?

Ask how post-quantum affects your organization

How I can help your organization

Post-quantum is not just new algorithms. It's decisions about data, time, and trust. I work with organizations that want to consciously prepare for change.

Exposure screening

A quick reconnaissance of data, flows, and cryptographic dependencies to determine whether the organization requires further analysis and where to start.

  • Data triage for long-term confidentiality
  • Mapping of key data flows and communication channels
  • Identifying cryptographic mechanisms protecting critical flows
  • Preliminary qualification of exposure to the HNDL scenario
  • Report with priorities for further analysis

Crypto-governance support

Building organizational capacity to manage cryptography: from organizing knowledge about dependencies, through ownership and decision-making processes, to measurable accountability.

  • Establishing program ownership and accountability for cryptographic decisions
  • Defining a collaboration model between security, IT, architecture, procurement, legal, and business
  • Preparing principles for cryptography inventory and dependency classification
  • Linking cryptography to data, flows, systems, vendors, and owners
  • Defining metrics, reporting, and escalation processes for cryptographic risks

Migration roadmap

Translating knowledge about data, dependencies, and responsibilities into a migration plan: priorities, stages, requirements for systems and vendors, and principles for maintaining crypto-agility.

  • Prioritizing migration areas by risk, criticality, and data horizon
  • Selecting a migration path for key dependencies: hybrid, update, replacement, or vendor control
  • Defining requirements for architecture, PKI, certificates, protocols, and the cryptography lifecycle
  • A roadmap of technical, organizational, and procurement decisions

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Why PostQ.pl?

PostQ.pl was created for one reason: most organizations underestimate how long their data lives and how much quantum computers will undermine today's guarantees of confidentiality and trust.

I combine technical, strategic and educational experience. I help security teams, boards and lawyers talk about post-quantum in the same language and make decisions that make sense in a 5–10 year horizon.

  • Working with organizations in regulated and technology sectors
  • Focus on long-lived data (finance, healthcare, government, legal)
  • Recommendations based on NIST, ENISA and ETSI standards
Michał Pietrus

Consultant

Michał Pietrus

I work on communication security and cryptography, and how they translate into real business and regulatory decisions.

If you want to discuss how post-quantum will affect your organization, let's start with a short conversation — no strings attached.

Let's talk about post-quantum in your organization

Write a few sentences about your situation. I'll follow up with a short, no-obligation conversation proposal and we'll see if and how I can help.

I keep your data confidential. I will use them only for contacting you regarding PostQ.pl.

How does a quantum computer affect digital communication?

Communication confidentiality over time

Encrypted data intercepted today can be decrypted and revealed in the future, increasing the risk of leaks of long-lived information.

Data trust

A quantum computer undermines today's guarantees that information is authentic and untampered, affecting the credibility of digital communication-based processes.

Identity certainty

A quantum computer weakens methods for confirming who is actually participating in communication, increasing the risk of impersonation and bad decisions.

Longevity of digital signatures

Signatures based on classical algorithms are losing resilience, which over time undermines the evidentiary value of documents and transactions.

Strategic predictability

What has simply worked so far, the quantum computer changes and forces a new approach to digital communication security.

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