Question 1

What is cryptography in blockchain?

Accepted Answer

Cryptography in blockchain is the use of mathematical techniques to secure transactions, protect identities, verify data, and maintain trust in a decentralized network. It includes hashing, public-key encryption, digital signatures, and privacy technologies such as zero-knowledge proofs.

Question 2

Why are cryptographic hash functions important in blockchain?

Accepted Answer

Cryptographic hash functions create unique digital fingerprints for transactions and blocks. They help detect unauthorized changes, connect blocks together, support Merkle trees, and preserve the integrity of blockchain records.

Question 3

How do private keys protect blockchain assets?

Accepted Answer

A private key is a secret cryptographic value used to sign transactions and prove ownership of blockchain assets. Anyone who controls the private key may be able to authorize transfers, so secure storage, backups, and protection against phishing are essential.

Question 4

What is the difference between encryption and hashing?

Accepted Answer

Encryption transforms data into a protected form that can generally be reversed with the correct key. Hashing creates a one-way fixed-length output used mainly for verification and integrity. Blockchain systems use both concepts, although hashing and digital signatures are especially central to most public blockchains.

Question 5

How will quantum computing affect blockchain cryptography?

Accepted Answer

Powerful quantum computers could eventually threaten some widely used public-key cryptographic algorithms. Blockchain developers are researching post-quantum cryptography and quantum-resistant signatures to help protect digital assets and decentralized networks against future attacks.

Cryptography in Blockchain