Question: 3. What is/are the main difference(s) between symmetric/private key encryption systems (such as affine ciphers, Vigenere ciphers, Enigma ciphers, DES, AES, . . . )

3. What is/are the main difference(s) between symmetric/private key encryption systems (such as affine ciphers, Vigenere ciphers, Enigma ciphers, DES, AES, . . . ) and asymmetric/public key encryption systems (such as RSA, Diffie-Hellman Key Exchange, El Gamal, . . . )? 4. Why would encrypting twice with an affine cipher not increase security?

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