Cryptohack is a fun platform for learning modern cryptography
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Introduction
https://cryptohack.org/challenges/introduction/
Cryptohack Solutions
General
https://cryptohack.org/challenges/general/
Mathematics
https://cryptohack.org/challenges/maths/
Symmetric Ciphers
https://cryptohack.org/challenges/aes/
RSA
https://cryptohack.org/challenges/rsa/