What is Bcrypt and why is it used for passwords?

Bcrypt is an adaptive password-hashing function based on the Blowfish cipher. It incorporates a random 128-bit salt and an adjustable work factor to resist GPU and ASIC brute-force attacks.

What does the cost factor (work factor) mean?

The cost factor determines the number of key expansion rounds (2^cost). A cost of 10 means 1,024 rounds, while a cost of 12 means 4,096 rounds, increasing hashing time exponentially.

Why does the hash change every time I hash the same password?

Bcrypt generates a cryptographically random 16-byte salt for each operation. Even identical passwords produce completely different hash strings, preventing rainbow table attacks.

Can anyone on the network see my passwords?

No. The entire bcrypt routine runs locally in your web browser's JavaScript engine. No data is ever transmitted to FileXShare servers.

Bcrypt Hash Generator

Tool Guide

Bcrypt Hash Generator & Verifier — Legacy Password Hashing: What It Does

Hashes passwords using the Eksblowfish bcrypt algorithm and verifies candidate passwords against existing hashes. It supports cost factors from 4 to 14 and produces standard Modular Crypt Format ($2a$, $2b$) strings.

Example

Input

password123, cost 10

Output

$2b$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy

Generates a random salt and applies 2^10 key expansion rounds.

How to Use

Type a password into the input field and select a work factor (default 10 or 12).
Click Hash to generate a standard Modular Crypt Format bcrypt string.
Switch to the Verify tab to test passwords against existing hashes.

Limitations

Bcrypt truncates passwords longer than 72 bytes due to an internal Blowfish cipher limit.
Work factors above 12 take multiple seconds to compute on low-powered client devices.

Frequently Asked Questions

What is the recommended bcrypt work factor for production applications?

A cost factor between 10 and 12 strikes a balance between strong brute-force resistance and sub-second authentication latency.

Why does hashing the same password twice produce different bcrypt strings?

Bcrypt generates a fresh random 128-bit salt for every hash, ensuring identical passwords never yield identical hash outputs.

Embed or Cite Bcrypt Hash Generator & Verifier — Legacy Password Hashing

Embed this interactive utility directly into documentation or blog posts, or link via GitHub badge:

Free for Blogs & Docs

HTML Embed Code (iframe):

<iframe src="https://filexshare.com/security/bcrypt-generator" width="100%" height="650" frameborder="0" title="Bcrypt Hash Generator & Verifier — Legacy Password Hashing - FileXShare"></iframe>
<p><a href="https://filexshare.com/security/bcrypt-generator" rel="nofollow">Powered by FileXShare</a></p>

Markdown / README Badge:

[![Bcrypt Hash Generator & Verifier — Legacy Password Hashing](https://img.shields.io/badge/Mango%20Developer-Bcrypt%20Hash%20Generator%20%26%20Verifier%20%E2%80%94%20Legacy%20Password%20Hashing-orange?style=flat&logo=code)](https://filexshare.com/security/bcrypt-generator)

Related Tools

Explore Cryptography Suite

Password Strength Checker & Entropy Analyzer

Score password strength with entropy bits, crack-time estimates, and actionable hardening suggestions.

CryptographyOpen →

JWT Debugger & Encoder

Decode, encode, and verify JSON Web Tokens (JWT) safely in your browser with expiration countdown and signature verification.

TokensOpen →

IP Address & CIDR Subnet Calculator

Calculate IPv4 subnet masks, CIDR network address, broadcast address, and usable host ranges.

NetworkingOpen →

Hash Generator & Checksum Verifier

Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512, and HMAC hashes for text or files, with checksum comparison. MD5/SHA-1 are legacy compatibility options — never use fast hashes for passwords.

Encoding & HashingOpen →

Inputs stay in browser memory. No external request is required for this operation, and zero data leaves your device.