If you'd like to read a book, Cryptography Engineering is probably the best all around introduction. If you're looking for an online resource, try Crypto101 (h

If you'd like to read a book, Cryptography Engineering is probably the best all around introduction. If you're looking for an online resource, try Crypto101 (https://raw.githubusercontent.com/crypto101/crypto101.github.io/master/Crypto101.pdf https://raw.githubusercontent.com/crypto101/crypto101.github...).