What is a Cryptographic Hash?

A cryptographic hash function is a mathematical algorithm that maps data of arbitrary size (like a password, a string of text, or a file) to a bit array of a fixed size (the "hash" or "message digest"). It is a one-way function, meaning it is computationally infeasible to invert a hash back into its original text.

Understanding MD5 and SHA-256

MD5 (Message-Digest algorithm 5) is a widely used hash function producing a 128-bit hash value. While it is no longer considered cryptographically secure against collision attacks, it remains popular as a checksum to verify data integrity. SHA-256 (Secure Hash Algorithm 256-bit) is part of the SHA-2 family designed by the NSA. It provides significantly stronger security and is the industry standard for modern security applications, including Bitcoin mining and SSL certificates.

Zero-Server Processing

When you hash a password, an API key, or a confidential document, you absolutely should not transmit the raw data across the internet. Sending passwords to online hashing websites is a massive security risk. DevvTools computes MD5, SHA-1, SHA-256, and SHA-512 hashes 100% locally in your browser using client-side Web Crypto APIs. Your data never leaves your device.