Question: (1) Symmetric Encryption Example: Stream Cipher: RC4 by Ron Rivest in 1987 Encryption: XOR11001100(Plaintext)0110110010100000(Ciphertext) Decryption: 10100000(Ciphertext)11001100(Plaintext)XOR01101100 (2) Example of RSA algorithm (the most widely accepted

(1) Symmetric Encryption Example: Stream Cipher: RC4 by Ron Rivest in

(1) Symmetric Encryption Example: Stream Cipher: RC4 by Ron Rivest in 1987 Encryption: XOR11001100(Plaintext)0110110010100000(Ciphertext) Decryption: 10100000(Ciphertext)11001100(Plaintext)XOR01101100 (2) Example of RSA algorithm (the most widely accepted and implemented approach to Public Key Encryption): (Ron Rivest, Adi Shamir, and Len Adleman received 2002 Turing Award) Encryption: Given plaintext (88), 887mod187=11(Ciphertext)(PublicKey=7,187) Decryption: Given ciphertext (11), 1123mod187=88(Plaintext)(PrivateKey=23,187) Key generation: Select p,q (prime numbers, p=q ), calculate n=pq, then calculate (n)=(p1)(q1). Select e such that e is relatively prime to (n) and

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