Is Web Crypto API secure for generating hashes and passwords?

Yes. The Web Crypto API (window.crypto.subtle and crypto.getRandomValues) is the official W3C cryptographic standard implemented directly in compiled browser engines. It utilizes high-quality hardware entropy sources and OS cryptographic primitives.

What is a good entropy score for a secure password?

According to NIST and modern security recommendations, a password with at least 60 bits of entropy is considered strong for general web accounts, and 80+ bits is considered very strong and resilient against offline GPU cluster attacks.

Why is MD5 flagged as non-cryptographic?

MD5 is vulnerable to collision attacks where two different inputs produce the exact same hash output. It is included here solely for verifying legacy checksums or file integrity comparisons.

Secure Cryptographic Hash & Password Entropy Lab

Hardware-accelerated SHA-256/512 hashes, HMAC, NIST 800-63B password entropy score, and brute-force time lab.

Security Guarantee: 100% Client-Side In-Browser Execution. Computations run locally within browser RAM. Zero remote telemetry.

Technical Overview & Architecture

A client-side cryptographic workbench powered by the Web Crypto API (SubtleCrypto). Generate SHA-1, SHA-256, SHA-384, SHA-512, MD5 hashes, and HMAC signatures. Calculate password entropy bits, brute-force crack time estimates across GPU clusters, and generate cryptographically secure passwords.

The hashing engine uses window.crypto.subtle.digest() and window.crypto.subtle.sign(), which interface directly with underlying OS-level cryptographic libraries (OpenSSL/BoringSSL/CNG) via browser native code. For random generation, crypto.getRandomValues() samples the OS entropy pool.

Key Capabilities & Features

Native Web Crypto API (SubtleCrypto): Computes SHA-1, SHA-256, SHA-384, SHA-512, and HMAC signatures directly in hardware-accelerated browser primitives.
NIST 800-63B Password Entropy Calculator: Calculates true mathematical entropy bits (E = L * log2(R)) based on character pool diversity and length.
Brute-Force Crack Time Matrix: Estimates attack resistance against throttled online guessing (10/s), unthrottled online (1k/s), fast GPU arrays (100B/s), and supercomputers.
CSPRNG Random Password & Passphrase Generator: Generates unguessable passwords and multi-word passphrases using cryptographically secure random values (crypto.getRandomValues).

Step-by-Step Usage Guide

Generate Hashes or Signatures: Enter any text string or payload to generate instant SHA-256, SHA-512, SHA-384, SHA-1, and MD5 hashes simultaneously.
Test Password Strength & Entropy: Type or generate a password to inspect its entropy bits, character set distribution, and resistance to modern GPU cracking arrays.
Generate Secure Credentials: Use the CSPRNG generator with customizable character sets or multi-word passphrases for maximum security.

Frequently Asked Questions (FAQ)

Is Web Crypto API secure for generating hashes and passwords?: Yes. The Web Crypto API (window.crypto.subtle and crypto.getRandomValues) is the official W3C cryptographic standard implemented directly in compiled browser engines. It utilizes high-quality hardware entropy sources and OS cryptographic primitives.
What is a good entropy score for a secure password?: According to NIST and modern security recommendations, a password with at least 60 bits of entropy is considered strong for general web accounts, and 80+ bits is considered very strong and resilient against offline GPU cluster attacks.
Why is MD5 flagged as non-cryptographic?: MD5 is vulnerable to collision attacks where two different inputs produce the exact same hash output. It is included here solely for verifying legacy checksums or file integrity comparisons.