1.Introduction 1.1.Classical Ciphers 1.2.Secret Key Encryption 1.3.Public-Key Encryption 2.Homomorphic Encryption 2.1.Homomorphic Encryption Definition 2.2.Goldwasser-Micali Encryption Scheme 2.3.ElGamal Encryption Scheme 2.4.Paillier Encryption Scheme 2.5.Boneh-Goh-Nissim Encryption Scheme 3.Fully Homomorphic Encryption 3.1.Fully Homomorphic Encryption Definition 3.2.Overview o…