Prof. Dan Boneh's Cryptography I is really good. Compared to many other MOOCs, it provides solid foundations while being easy to follow. https://www.coursera.

Prof. Dan Boneh's Cryptography I is really good. Compared to many other MOOCs, it provides solid foundations while being easy to follow. https://www.coursera.org/learn/crypto https://www.coursera.org/learn/crypto