4. Compute the following logarithms: (a) log2128 (b) log327 (c) log464 (d) log5625 (e) log71 5. Compute the following using modular arithmetic: (a) 42 mod 9 (b) 146 mod 23 (c) 5 + 7 mod 10 (d) 9 2 mod 17 (e) 27 mod 11 6. Use the Caesar cipher to encrypt the following plaintext: AGENT COOPER IS IN THE BLACK LODGE 7. Use the Caesar cipher to decrypt the following ciphertext: WKH RZOV DUH QRW ZKDW WKHB VHHP 8. Use the Vigenre cipher to encrypt the following plaintext using the key PETE: THERE WAS A FISH IN THE PERCOLATOR 9. Use the Vigenre cipher to decrypt the following ciphertext using the key LAURA: QILV WLLE NIEH GV

10. CSCI 5613 students only: write a short summary of Cryptography and Computer Privacy -