CONTENTS: 1.Integers 1.1.Natural Numbers 1.2.The Euclidean Algorithm 1.3.Fermat's Little Theorem and Its Generalisations 1.4.The Ring of Integers Modulo n. The Field Zp 1.5.Representation of Numbers 2.Cryptology 2.1.Classical Secret-Key Cryptology 2.2.Modern Public-Key Cryptology 2.3.Computational Complexity 2.4.The RSA Public-Key Cryptosystem 2.5.Applications of Cryptology 3…