Chinese Remainder Theorem Courses
University of California, San Diego via Coursera Mathematical Foundations for Cryptography
University of Colorado System via Coursera A Basic Course in Number Theory
Indian Institute of Technology Bombay via Swayam Number Theory
YouTube Number Theory
YouTube Number Theory and Algebra in Asia - Math History - NJ Wildberger
Insights into Mathematics via YouTube Seven Magic Crypto Tricks - Meet Eve the Magician
Bill Buchanan OBE via YouTube Chinese Remainder Theorem - Number Theory
Michael Penn via YouTube The Selberg Sieve - Lecture 1
International Centre for Theoretical Sciences via YouTube Number Theory and Algebra in Asia - Math History
Insights into Mathematics via YouTube