EBK COMPUTER NETWORKING
7th Edition
ISBN: 8220102955479
Author: Ross
Publisher: PEARSON
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Chapter 8, Problem R5RQ
Program Plan Intro
8-Block Cipher:
An 8-Block Cipher is a method of encrypting text in which a cryptographic key and
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In block ciphers, if we use AES for encryption, it does not matter whether the cipher is CBC-based or ECB-based (both will have equally strong results).
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Question 1
Study the scenario and complete the question(s) that follow:
Ceasar Cipher
The Caesar Cipher technique is one of the earliest and simplest method of encryption technique. It's
simply a type of substitution cipher, i.e., each letter of a given text is replaced by a letter some fixed
number of positions down the alphabet. For example with a shift of 1, A would be replaced by B, B
would become C, and so on. The method is apparently named after Julius Caesar, who apparently
used it to communicate with his officials.
1.1 Write a Ceasar cipher algorithm in such a way that a character D is changed to N. Derive
the encryption of the other characters accordingly.
1.2 Based on your algorithm, what will be the encrypted code of the message “my mother is not
home".
End of Question 1
Chapter 8 Solutions
EBK COMPUTER NETWORKING
Ch. 8 - Prob. R1RQCh. 8 - Prob. R2RQCh. 8 - Prob. R3RQCh. 8 - Prob. R4RQCh. 8 - Prob. R5RQCh. 8 - Prob. R6RQCh. 8 - Prob. R7RQCh. 8 - Prob. R8RQCh. 8 - Prob. R9RQCh. 8 - Prob. R10RQ
Ch. 8 - Prob. R11RQCh. 8 - Prob. R12RQCh. 8 - Prob. R13RQCh. 8 - Prob. R14RQCh. 8 - Prob. R15RQCh. 8 - Prob. R16RQCh. 8 - Prob. R17RQCh. 8 - Prob. R18RQCh. 8 - Prob. R19RQCh. 8 - Prob. R20RQCh. 8 - Prob. R21RQCh. 8 - Prob. R22RQCh. 8 - Prob. R23RQCh. 8 - Prob. R24RQCh. 8 - Prob. R25RQCh. 8 - Prob. R26RQCh. 8 - Prob. R27RQCh. 8 - Prob. R28RQCh. 8 - Prob. R29RQCh. 8 - Prob. R30RQCh. 8 - Prob. R31RQCh. 8 - Prob. R32RQCh. 8 - Prob. R33RQCh. 8 - Prob. P1PCh. 8 - Prob. P2PCh. 8 - Prob. P3PCh. 8 - Prob. P4PCh. 8 - Prob. P5PCh. 8 - Prob. P6PCh. 8 - Prob. P8PCh. 8 - Prob. P12PCh. 8 - Prob. P13PCh. 8 - Prob. P14PCh. 8 - Prob. P18PCh. 8 - Prob. P20PCh. 8 - Prob. P21PCh. 8 - Prob. P22PCh. 8 - Prob. P23P
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Similar questions
- Asymmetric ciphers are more secure because they use non-reversible procedures. This chapter introduced asymmetrical operations. If so, what are some asymmetric operations?arrow_forwardWhat is the size of the keyspace for a double transposition cipher with m * n matrix? Justify your answer.arrow_forwardWhen forming a public key for an RSA cipher, real applications involve pairs of long prime numbers, p and q so N=pq. The intention is to make it too time-consuming to factor the public component into the prime factors. Briefly explain why N=64615 would not be an effective public key.arrow_forward
- Let S1 and S, be the standard Vigenere and Permutation ciphers, respectively, with P = (Z26)° (so the block length of each is m = 5). Consider the product cipher S1 x S2. Consider the keycode k1 = latex in Vigenere Cipher, and the key kɔ in Permutation Cipher given by 12345 45213 Find the decryption d(k, k)(IEAEDURMZXALZTM) in S1 x S,. Enter your four words plaintext in the boxes below in the order.arrow_forwardLet E'(T,X) be a tweakable block cipher that has already been keyed. Given plaintext P = P1 || P2 || ... || Pn (ie, P is an n-block plaintext). Ci = E'(i, Pi) for i=1..nsum = P1 xor P2 xor ... xor Pntag = E'(0,sum) For simplicity let's say that E'(T,X) = ROTL(X,T+1) (ie, X rotated left T+1 bits. If the block cipher block size is 8 bits and you are encrypting the two byte plaintext 67 89, what ciphertext and tag would be created? Fill in each box as a two-digit hex value. C1____? C2____? tag____?arrow_forwardLook up the following properties of a cryptographic hash function on the internet or elsewhere: Collision resistance, hiding, and puzzle friendliness. Give a careful formal definition. This could be copied, if so, make it clear where it is from. Then in your own words explain what each of the properties means and why it is an important property to ensure security.arrow_forward
- In an affine cipher, if k = (a, b) = (3, 7), then what is the encryption of x=9. Answer by typing just the resulting number in the box.arrow_forwardWhat about encrypting an AES key with a secret password? Make a case for why your answer is correct.Look at the keyed hash function as an alternative to the hash function. Check out a sample hash function with a single key.arrow_forwardConsider a Feistel cipher composed of 16 rounds with block length 128 bits and key length 128 bits. Suppose that, for a given k, the key scheduling algorithm determines values for the first eight round keys, k₁, k₂, ..., kg, and then sets kg = kg, k10= k1, k11=k6,..., k16 = k₁arrow_forward
- 4. Choose any 1 cipher methods of your choice and explain its working with examplearrow_forwardShow that decryption in a Feistel cipher can be done by applying the encryption algorithm to the ciphertext, with key schedule reversed.arrow_forwardFor affine cipher, the key is a pair (a,b) for a,b<26. The encryption algorithm is E(x)=(ax+b) mod 26. And the decryption algorithm is D(y)=a¹(y-b) mod 26. Note that we map A, B, C, D, ... to numbers 0, 1, 2, 3, ... respectively. Assume that K=(7,3), then E(x)=(7x+3) mod 26, and 7-1-15. Thus D(y)=15(y-3) mod 26. 1. For the key K=(7,3), computer the cipher text for "GOLUNCH" is (please use all capital letters) 2. For the key K=(7,3), try to decrypt the cipher text "YHQQFPGHJF" is (please use all capital letters)arrow_forward
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