# Crypta: A fingerprint for any data

> A from-scratch SHA-256 (padding, message schedule, 64 compression rounds) with an avalanche heatmap and a proof-of-work miner. 9 tests, cross-checked byte-for-byte against Node's crypto across all padding boundaries.

Crypta is a hands-on SHA-256 explorer that turns any input into a fixed-size hash and visualises how a single bit flip cascades through the output. The signature technique is a from-scratch implementation of the full algorithm - padding, the message schedule, and all 64 compression rounds - paired with an avalanche heatmap and a proof-of-work miner, cross-checked byte-for-byte against Node's crypto across every padding boundary. It is a dependency-light build you can download and run locally.

## About the app

Cryptography

## What to take away

- A from-scratch SHA-256 (padding, message schedule, 64 compression rounds) with an avalanche heatmap and a proof-of-work miner. 9 tests, cross-checked byte-for-byte against Node's crypto across all padding boundaries.
- Download: Crypta (ZIP)

## Tags

Free software, Crypta

## Read the full write-up

/downloads/crypta.zip

## We build this for clients

https://dfieldsolutions.com/en/services/full-stack

## More from the lab

- https://dfieldsolutions.com/en/lab/sylex.md — Sylex: Make sense of the slashes
- https://dfieldsolutions.com/en/lab/kindra.md — Kindra: Miss a beat, not the rhythm
- https://dfieldsolutions.com/en/lab/voxara.md — Voxara: Argue better. Lose gracefully
- https://dfieldsolutions.com/en/lab/wraithward.md — Wraithward: Spot the bait before you bite

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Source: https://dfieldsolutions.com/en/lab/crypta
DField Solutions — Torony köz 5-1.a, 2120 Dunakeszi, Hungary — +36 20 722 0002 — dezso@dfieldsolutions.com
Booking: see https://dfieldsolutions.com/en/contact