- YouTube - Introduction to Cryptography by Christof Paar
- https://www.coursera.org/learn/crypto
- Book - Introduction to Modern Cryptography, by Katz and Lindell: This book emphasizes mathematical rigor (precise definitions and proofs) and is helpful if you're looking to build a strong theoretical foundation.
- https://crypto.stanford.edu/~dabo/cryptobook/BonehShoup_0_4.pdf (for book lovers)
- https://cryptopals.com/
- http://doctrina.org/How-RSA-Works-With-Examples.html