What is a hash function?

A hash function takes any input and produces a fixed-size output. It's one-way: you can't reverse it.

Which hash algorithm to use?

SHA-256 or SHA-512 for general purposes. MD5 and SHA-1 are insecure but useful for checksums.

What is hashing used for?

Password storage, data integrity, digital signatures, file deduplication, and blockchain.

What is the difference between MD5 and SHA-256?

MD5 produces a 128-bit hash and is considered insecure due to collision vulnerabilities. SHA-256 produces a 256-bit hash and is currently secure. Use SHA-256 or SHA-3 for any security-critical application.

Can a hash be reversed to find the original text?

Hash functions are one-way by design and cannot be mathematically reversed. However, attackers use rainbow tables and brute force to find inputs that produce a known hash. Salting prevents rainbow table attacks.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

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MD5 (128-bit)

SHA-1 (160-bit)

SHA-256 (256-bit)

SHA-512 (512-bit)

What is a Hash?

A hash function converts data of any size into a fixed-size string of characters. The output (hash) is unique to the input - even a tiny change produces a completely different hash.

Hashes are one-way functions: you cannot reverse them to get the original data.

Hash Algorithm Comparison

MD5: Fast but considered cryptographically broken. Still used for checksums.

SHA-1: More secure than MD5 but also deprecated for security use.

SHA-256: Part of SHA-2 family. Widely used and secure. Recommended for most purposes.

SHA-512: Larger output, slightly more secure than SHA-256. Better for password hashing.

Common Use Cases

Password Storage: Store password hashes instead of plain text passwords.

File Integrity: Verify files haven't been modified or corrupted.

Digital Signatures: Ensure authenticity of documents and messages.

Checksums: Quick comparison of large datasets.

Hash Generator

What is a Hash?

Hash Algorithm Comparison

Common Use Cases

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