Hash Function
Algorithm that transforms data into a unique and irreversible fingerprint.
Beginner-friendly explanation
A hash function takes information (like a text) and transforms it into a unique "secret code." Even a small change in the input produces a completely different result.
๐ Example: "Bonjour" becomes a totally different code from "bonjour" after hashing.
Intermediate-level insight
A hash function is a mathematical algorithm that converts data into a fixed-length string. It guarantees integrity and security: you cannot retrieve the original information from the hash.
๐ Example: SHA-256 is used to secure Bitcoinโs blocks.
Advanced perspective
Cryptographic hash functions must satisfy properties such as determinism, avalanche effect, collision resistance, and preimage resistance. They are used to sign transactions, secure blocks, generate public addresses, and validate data integrity.
๐ Example: In modern blockchains, SHA-3 and Blake2 are considered to replace SHA-2, offering better guarantees against quantum attacks.
Blockchain & Technology
hash function, hash, cryptography, data integrity, collision, preimage, SHA-256, security