Thanks for mentioning CryptoHack! Yes while some challenges overlap, we also explore more deeply the mathematics of cryptography, as well as its practical use

Thanks for mentioning CryptoHack! Yes while some challenges overlap, we also explore more deeply the mathematics of cryptography, as well as its practical use in protocols like TLS. We recently added challenges on lattice-based post-quantum cryptography. In this way it makes a great complement to CryptoPals. But it's not all harder, our introductory section gradually introduces concepts like base64 encoding and the modulo operator one challenge at a time.