This developer security utility provides an interactive playground for exploring salted password hashing structures, bcrypt cost factors, and hash verification mechanics. Software engineers designing authentication schemas can inspect how logarithmic iteration rounds ($2^N$) impact compute complexity and verify password candidate matching.

### Bcrypt Hash Anatomy and Cost Factors A standard Modular Crypt Format bcrypt hash (such as `$2a$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy`) encodes three distinct elements:

- **Algorithm Identifier (`$2a$` or `$2b$`):** Identifies the bcrypt scheme version. - **Cost Factor / Work Factor (e.g. `10`):** Defines the key expansion iteration count as $2^{\text{costFactor}}$. Cost 10 executes $2^{10} = 1,024$ key expansion rounds, while cost 12 executes $2^{12} = 4,096$ rounds, doubling compute time with each increment. - **Salt and Digest (53 characters):** A 16-byte cryptographically secure salt concatenated with the 24-byte Blowfish cipher output encoded in modified Base64.

### Interactive Verification Sandbox Example The tool includes a candidate password verification sandbox:

1. **Plain Password:** User sets a reference password (defaults to `MySecurePassword2026!`). 2. **Adjust Cost Slider:** User moves the Bcrypt Cost slider between 4 and 14 rounds to observe the logarithmic scaling notice (e.g. $2^{12} = 4,096$ iterations). 3. **Candidate Verification:** Typing matching credentials into the Verification Sandbox displays a green confirmation status badge (`Password matches the Bcrypt hash!`). Altering any character triggers an immediate mismatch warning (`Hash mismatch! Incorrect password.`).

### Honest Implementation Note This tool currently operates as an interactive educational demonstration sandbox for exploring bcrypt hash anatomy, cost factor scaling ($2^N$), and verification workflows. It does not compile WebAssembly Argon2 or execute server-side native C bcrypt libraries.

### Privacy and Client-Side Execution All state updates, cost factor sliders, and password string comparisons run entirely in client-side React. No passwords, credentials, or hash strings are transmitted across any network.