What is a hash function and how does it work?

What is a hash function and how does it work?

A hash function is a mathematical algorithm that transforms input data into a fixed-size string of characters, which is typically a hash code. It works by taking an input (or 'message') and returning a unique output that represents that input.

Can you give me an example of a hash function?

Sure! A common example is the SHA-256 hash function, which produces a 256-bit hash value. It's widely used in security applications and protocols, including SSL and blockchain.

What are some practical uses of hash functions?

Hash functions are used in various applications such as data integrity verification, password storage, and digital signatures. They help ensure that data has not been altered.

Are hash functions reversible?

No, hash functions are designed to be one-way functions, meaning you cannot easily reverse the process to retrieve the original input from the hash output.