CryptoHack teaches modern cryptography through free interactive challenges and exercises.
CryptoPals
CryptoPals offers cryptography challenges organized into sets, beginning with foundational exercises.
About CryptoPals
CryptoPals is a collection of programming exercises for learning cryptography by implementing attacks. Its eight sets run from basics through block and stream crypto, randomness, Diffie-Hellman, RSA and DSA, hashes, and abstract algebra. You need to be able to code proficiently in some language; no prior cryptography knowledge is required, and the sets get progressively harder.
Pricing is not clearly stated.
Key features
- Exercises demonstrate attacks on real-world crypto
- Problems are derived from weaknesses in real-world systems and modern cryptographic constructions
- The site provides enough information to learn the underlying concepts
- Solutions can be written in any programming language
- The problems are not designed as trick puzzles
Best for: People who can already code and want to learn how cryptosystems are built and attacked.
CryptoPals at a glance
- Website
- cryptopals.com
- Category
- Education & Learning › Learn to Code
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Details verified
- Oct 22, 2026 · Official source
- Open source
- Not stated
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Open source
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CryptoPals FAQ
How much math do I need?
The site says many modern crypto attacks do not involve much hard math, and suggests a local ninth grader can help with difficult parts.
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