>>12104780Algebra by Artin to learn the requisite ring theory
Your favorite number theory textbook
Relevant intro theory book for cryptography
https://www.math.brown.edu/~jhs/MathCryptoHome.htmlPractical cryptosystem design and engineering:
https://www.schneier.com/books/cryptography-engineeringhttp://cacr.uwaterloo.ca/hac/After this, learn whatever else seems fun to you. Personally I think RLWE is a fun topic, but I like theory more.
