The document contains examples of encrypting and decrypting messages using various cipher techniques like Caesar cipher, transposition cipher, Vigenère cipher, and RSA. It provides ciphertext messages and asks to decrypt them by applying the corresponding encryption algorithms in reverse. It also gives encryption keys and asks to encrypt plaintext messages using the specified encryption methods.
The document contains examples of encrypting and decrypting messages using various cipher techniques like Caesar cipher, transposition cipher, Vigenère cipher, and RSA. It provides ciphertext messages and asks to decrypt them by applying the corresponding encryption algorithms in reverse. It also gives encryption keys and asks to encrypt plaintext messages using the specified encryption methods.
The document contains examples of encrypting and decrypting messages using various cipher techniques like Caesar cipher, transposition cipher, Vigenère cipher, and RSA. It provides ciphertext messages and asks to decrypt them by applying the corresponding encryption algorithms in reverse. It also gives encryption keys and asks to encrypt plaintext messages using the specified encryption methods.
The document contains examples of encrypting and decrypting messages using various cipher techniques like Caesar cipher, transposition cipher, Vigenère cipher, and RSA. It provides ciphertext messages and asks to decrypt them by applying the corresponding encryption algorithms in reverse. It also gives encryption keys and asks to encrypt plaintext messages using the specified encryption methods.
8.1. Encrypt the message STOP POLLUTION by translating the letters into numbers, applying the given encryption function, and then translating the numbers back into letters. STOP POLLUTION 18,14,19,15 15,14,11,11,20,19,8,14,13
8.2. Decrypt these messages that were encrypted using the Caesar cipher. a) EOXH MHDQV
f(p)=(p+3) mod 26 BLUE JEANS 1,11,20,4 9,4,0,13,18
b) WHVW WRGDB
f(p)=(p+3) mod 26 TEST TODAY 19,4,18,19 19,14,3,0,24
c) HDW GLP VXP
f(p)=(p+3) mod 26 EAT DIM SUM 4,0,19 3,8,12 18,20,12
8.3. Suppose that the ciphertext ERC WYJJMGMIRXPC EHZERGIH XIGLRSPSKC MW
MRHMWXMRKYMWLEFPI JVSQ QEKMG was produced by encrypting a plaintext message using a shift cipher. What is the original plaintext? ANY SUFFICIENTLY ADVANCED TECHNOLOGY IS INDISTINGUISHABLE FROM MAGIC
8.4. Decrypt the message EABW EFRO ATMR ASIN which is the ciphertext produced by encrypting a plaintext message using the transposition cipher with blocks of four letters and the permutation σ of {1,2,3,4} defined by σ(1) = 3, σ(2) = 1, σ(3) = 4, and σ(4) = 2.
EABW EFRO ATMR ASIN
3142 3142 3142 3142
BEWA REOF MART IANS
8.5. The ciphertext OIKYWVHBX was produced by encrypting a plaintext message using the Vigenère cipher with key HOT. What is the plaintext message? This study source was downloaded by 100000816070467 from CourseHero.com on 04-16-2022 02:02:41 GMT -05:00
https://www.coursehero.com/file/74733317/Home-work-8-1docx/ HURRICANE key: HOT 8.6. Encrypt the message MATH using the RSA system with n = 43·59 and e = 5, translating each letter into integers and grouping together pairs of integers. MATH 12,00,19,07
Key (44*59,5) 2537=43*59 p=43, q=59
gcd (e, (p-1) (q-1)) = gcd (5, 43*58)= 1
8.7. What is the original message encrypted using the RSA system with n = 43·59 and e = 13 if the encrypted message is 0667 1947 0671 (d=937)?
S I L V E R 18 08 11 21 04 17
Key (43*59, 13) 2537=43*59, p=43, q-59
Gcd(e, (p-1) (q-1)) = gcd(13, 43*58) = 1
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