Labs / Crack SHA1 Hash

Daily Challenge
Released 09 Oct 2025

Can you crack this SHA1 hash?

A single SHA1 hash stands between you and victory. This cryptographic puzzle challenges you to reverse-engineer the original plaintext from its hashed form. Will you use brute force, rainbow tables, or clever wordlist attacks? The clock is ticking, and the hash is waiting to be broken.

1

Flags

1

Points

Daily Challenge

Free Access

Start Lab Environment

Launch your dedicated AWS machine to begin hacking

~1-2 min setup

AWS dedicated

Private instance

Industry standard

Daily Challenge

Solution Coming Soon

The solution for this lab will be available on 19 Oct 2025 16:00 UTC.

To keep the new labs challenging for everyone, solutions are only available 1 month after a lab has been released or when it gets archived, whichever comes first.

Crack SHA1 Hash

Daily Challenge 1 points

Writeup Guidelines

Share your solution approach, methodology, and insights. Your writeup will be reviewed before being published to the community. Earn +1 bonus point when your writeup is approved!

Requirements:

No flag content: Do not reveal actual flag values or passwords in your writeup
Include lab link: Your writeup must contain a direct link to this lab for reference
Educational focus: Explain your methodology, tools used, and learning insights

Writeup URL *

Link to your blog post, GitHub repository, or any platform where you've published your writeup
Remember to include this lab's URL in your writeup: https://hackerdna.com/labs/crack-sha1-hash

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I confirm that my writeup includes a direct link to this lab

Your writeup must reference this lab's URL: https://hackerdna.com/labs/crack-sha1-hash

I confirm that my writeup does NOT contain flag content or critical information

Do not include actual flags, passwords, or other sensitive information that would spoil the challenge