Cryptography: https://en.wikipedia.org/wiki/Cryptography https://www.geeksforgeeks.org/cryptography-and-its-types/ https://cryptography.io/en/latest/ https://www.garykessler.net/library/crypto.html https://www.tutorialspoint.com/cryptography/cryptography_tutorial.pdf https://www.cs.unibo.it/babaoglu/courses/security/resources/documents/intro-to-crypto.pdf https://www.vssut.ac.in/lecture_notes/lecture1428550736.pdf https://www.itu.int/en/ITU-D/Cybersecurity/Documents/01-Introduction%20to%20Cryptography.pdf Cryptanalysis: http://index-of.es/Varios-2/Modern%20Cryptanalysis.pdf http://www1.spms.ntu.edu.sg/~ccrg/documents/Cryptanalysis%20for%20Beginners%20-%20Ivica%20Nikolic.pdf https://www.cs.ru.nl/~rverdult/Introduction_to_Cryptanalysis-Attacking_Stream_Ciphers.pdf http://practicalcryptography.com/cryptanalysis/