Question 1

What is a cryptographic hash function?

Accepted Answer

A cryptographic hash function takes any input and produces a fixed-size output (the hash or digest). The same input always produces the same output, but small changes produce completely different hashes. Hashes are one-way — you cannot reverse them to recover the original input.

Question 2

What is SHA-256 used for?

Accepted Answer

SHA-256 is the most widely used hash function, employed in TLS/HTTPS certificates, code signing, file integrity verification, Bitcoin, and HMAC. It produces a 256-bit (64 hex character) digest.

Question 3

Is SHA-1 still safe to use?

Accepted Answer

SHA-1 is considered cryptographically broken for security purposes — collision attacks have been demonstrated. Do not use SHA-1 for digital signatures, certificates, or security-critical applications. It is still acceptable for non-security checksums.

Question 4

Can I hash a file with this tool?

Accepted Answer

This tool hashes text input only. To hash a file, paste the file contents as text, or use command-line tools like sha256sum (Linux/Mac) or CertUtil (Windows).

Hash Generator

Hash Generator

About these hash functions