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14 / THE FUTURE

Quantum Computing & Post-Quantum Cryptography

Understand why sufficiently capable quantum computers could challenge some cryptography, what post-quantum standards are, and why migration is a long-term engineering task.

10 lessonsBeginner → confidentLearn at your pace
NEWBEE SCHOOL14Read the lesson. Check yourself. Continue when it makes sense.
IN THIS TOPIC
01 · Why quantum matters02 · Shor’s algorithm03 · Hash functions are different04 · Post-quantum cryptography05 · NIST standards06 · Migration challenge07 · Crypto and exposed public keys08 · Quantum does not mean immediate loss09 · Zero-knowledge and new architectures10 · NEWBEE takeaway
LESSON 01

Why quantum matters

Quantum computers use quantum mechanical effects to process certain problems differently from classical computers. Cryptographic systems are affected differently depending on the underlying mathematics.

MENTAL MODEL / EXAMPLE
The concern is not that quantum computers instantly break every blockchain or encryption system.
CHECK YOURSELFFocus on which primitives are vulnerable and how migration works.
LESSON 02

Shor’s algorithm

Shor’s algorithm gives a quantum speedup for integer factoring and discrete logarithm problems, which underpin important public-key cryptography such as RSA and elliptic-curve systems.

MENTAL MODEL / EXAMPLE
Many blockchain signatures rely on elliptic-curve cryptography, so sufficiently capable quantum machines could change the threat model.
CHECK YOURSELFThis is a future migration challenge, not a reason to panic today.
LESSON 03

Hash functions are different

Quantum algorithms can also affect brute-force search against hashes, but the impact differs from the public-key case and can often be addressed by larger parameters.

MENTAL MODEL / EXAMPLE
Not every cryptographic primitive needs the same replacement strategy.
CHECK YOURSELFSecurity engineering is algorithm-specific.
LESSON 04

Post-quantum cryptography

PQC uses classical algorithms designed to resist known quantum attacks. It can be deployed on ordinary computers and networks.

MENTAL MODEL / EXAMPLE
PQC is not the same thing as quantum cryptography.
CHECK YOURSELFThe goal is practical migration before large-scale quantum threats arrive.
LESSON 05

NIST standards

NIST standardized ML-KEM for key establishment and ML-DSA and SLH-DSA for digital signatures in its post-quantum standards program.

MENTAL MODEL / EXAMPLE
These standards give engineers concrete building blocks for migration planning.
CHECK YOURSELFStandards evolve; always use current official guidance for implementation decisions.
LESSON 06

Migration challenge

Replacing cryptography in a live ecosystem involves software, hardware, protocols, wallets, exchanges, custody systems and backward compatibility.

MENTAL MODEL / EXAMPLE
A blockchain cannot simply “update the algorithm” without considering old keys, addresses and historical data.
CHECK YOURSELFMigration needs planning, testing and coordination.
LESSON 07

Crypto and exposed public keys

In some blockchain designs, public keys may become visible when an account spends. This can matter to future cryptographic threat models.

MENTAL MODEL / EXAMPLE
The details differ by chain and address design.
CHECK YOURSELFDo not generalize one chain’s exposure model to another.
LESSON 08

Quantum does not mean immediate loss

A future capable quantum computer is not the same as a current practical attack against everyday crypto wallets.

MENTAL MODEL / EXAMPLE
The responsible approach is risk assessment and migration planning.
CHECK YOURSELFAvoid both panic and complacency.
LESSON 09

Zero-knowledge and new architectures

Zero-knowledge proofs and other cryptographic systems can improve scalability or privacy, but they are not automatically quantum-safe.

MENTAL MODEL / EXAMPLE
Each construction must be evaluated against its own assumptions.
CHECK YOURSELFLearn the primitives instead of relying on labels.
LESSON 10

NEWBEE takeaway

The future lesson is simple: cryptography is infrastructure. When assumptions change, systems must migrate deliberately.

MENTAL MODEL / EXAMPLE
Keep your knowledge current and follow official standards and chain-specific security announcements.
CHECK YOURSELFNEWBEE rule: understand the migration, not the hype.
NEWBEE RULE

Learn → Verify → Protect.

Before moving money, connecting a wallet, trusting a claim or signing a transaction, slow down. Identify the exact asset, network, contract, source, permissions and risks.

Quantum Computing & Post-Quantum CryptographyBeginnerSecurityVerification