CryptoHack – a fun platform for learning cryptography
A free, fun platform to learn about cryptography through solving challenges and cracking insecure code. Can you reach the top of the leaderboard?
CryptoHack – a fun platform for learning cryptography launched on April 7, 2020 with 20 votes, #1,106 of 5,003 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 6 years on.
In plain words
CryptoHack is a learning platform for cryptography launched in 2020. It offers interactive challenges and exercises designed to teach cryptographic concepts through hands-on practice. The platform is intended for people interested in learning how encryption, decryption, and related security principles work. It combines education with an engaging format that makes cryptography accessible to learners at various skill levels.
written from the facts on this page · September 2026
From the sources
Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them. Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard ? Share your solutions with the CryptoHack community and learn together. We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues tofrom cryptohack.org
Does a similar job
all alternatives →
CryptoMonkey-Learn basics for free2025 · cryptomonkey.vercel.app · ▲55Learn Crypto like a monkey,total beginner!!
CrypTools' learn platform2018 · cryptools.github.io · ▲4A platform to learn cryptography by completing challenges
More dev tools this month
the category →
open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.
Dev tools · 27d ago · github.com
Contribute to reladraw/reladraw development by creating an account on GitHub.
Dev tools · 25d ago · github.com
OpenBot▲362Grok Bot alternative: free, local, open-source, multiplayer
Dev tools · 22d ago · openbot.run
Talanoa▲340Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…
Dev tools · 20d ago · talanoa.email
CoreSpeed▲332One MCP for everything your agents need: apps, memory, tools
Dev tools · 27d ago · corespeed.io
Source: Show HN post ↗
Launched alongside, April 2020
the whole month →
https://github.com/OlexG/finclaw ^ repo if anyone wants to contribute. I realized that sometimes I'm pretty good at making random guesses about the future. (I.E, I think OpenAI will beat Anthropic in the short term, etc...) However, I'm bad at converting these guesses into actual market plays I can profit from. As such, I wanted to make a tool that connects to the right APIs and launches a swarm of agent experts to generate related plays based on your prediction. The very first super shitty V0 MPV just has Polymarket/Kalshi bets, but I will be adding a more complex…
AI · 2020 · youtube.com
CleanShot X▲951Mac-native app for screenshots, recordings and collaboration
Dev tools · 2020 · cleanshot.com
For bureaucratic reasons, a colleague of mine had to print, sign, scan and send by email a high number of pages. To save trees, ink, time, and to...
Life & fun · 2020 · gitlab.com
