---
title: "Discussion on \"What Is a Hash Function? The Fingerprint Trick Behind Passwords and Downloads\" | Hashnode"
description: "Discussion on \"What Is a Hash Function? The Fingerprint Trick Behind Passwords and Downloads\". One small function turns any file into a short, unique fingerprint — and that fingerprint quietly holds the internet together"
url: "https://hashnode.com/posts/what-is-a-hash-function-the-fingerprint-trick-behind-passwords-and-downloads/6af275bafbe84965068b5201"
---

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# [What Is a Hash Function? The Fingerprint Trick Behind Passwords and Downloads](https://itsmeminsithu.hashnode.dev/what-is-a-hash-function-the-fingerprint-trick-behind-passwords-and-downloads?utm_source=hashnode&utm_medium=feed)

One small function turns any file into a short, unique fingerprint — and that fingerprint quietly holds the internet together

20h ago · 6 min read · itsmeminsithu.hashnode.dev  
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-   [#security](https://hashnode.com/tag/security)
-   [#cryptography](https://hashnode.com/tag/cryptography)
-   [#passwords](https://hashnode.com/tag/passwords)
-   [#computer-science](https://hashnode.com/tag/computer-science)
-   [#how-it-works](https://hashnode.com/tag/how-it-works)

## Written by

[Min SiThu](https://hashnode.com/@itsmeminsithu)

@itsmeminsithu · Singapore

  
[View profile](https://hashnode.com/@itsmeminsithu)

Software Engineer

Nubbad Developer. | Now I accidentally create problems.

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