Blockchain Developer Fundamentals and Cryptography 2

Question 1

What property of a cryptographic hash function ensures that finding two different inputs producing the same output is computationally infeasible?

Accepted Answer

Collision resistance

Answer

Collision resistance means it is infeasible to find two distinct inputs that hash to the same value.

Question 2

Which hashing algorithm does Bitcoin use for its proof-of-work and block hashing?

Accepted Answer

SHA-256

Answer

Bitcoin relies on SHA-256 for block hashing and mining.

Question 3

In a Merkle tree, what is stored at the root?

Accepted Answer

A single hash representing all leaf data

Answer

The Merkle root is a single hash that cryptographically commits to every leaf in the tree.

Question 4

What does an asymmetric key pair consist of?

Accepted Answer

A public key and a private key

Answer

Asymmetric cryptography uses a mathematically linked public and private key pair.

Question 5

Which curve is most commonly used for Bitcoin and Ethereum digital signatures?

Accepted Answer

secp256k1

Answer

Both Bitcoin and Ethereum use the secp256k1 elliptic curve for ECDSA signatures.

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