(c) Showing your working, compute also Friedman's Index of Coincidence for the text below and use this to estimate the key length. (d) Showing your working, find the key of the Vigenère cipher below. (e) Showing the working involved, decrypt the first line of the ciphertext.

Q: Encrypt the following message using Caesar cipher with a key of 3 The message is  (SECURITY IS THE…

A: answer starts from step 2

Q: Explain how a monoalphabetic substitution cipher works. Illustrate your explana- tion by using the…

A: In questions with many questions we must answer the first one.

Q: 4- In a Hill cipher, find decryption key if the encryption key: k- 3

A: Decryption key=(k inverse)mod 26

Q: Problem 3: (10 marks) Use the Caesar cipher (single coding) with an encryption key, K=9, what will…

A: Solution: In Caeser cipher, each letter present within the message is replaced by the letter present…

Q: a. Mention the drawback of Mono alphabetic cipher. o. Which Cipher is used to resolve the issue with…

A: The major impediment is that by substituting more than one character of ciphertext for each…

Q: Apply Vigenère Cipher using the key "SPANISH" to find the cypher text for the following plain text.…

A: The answer is given below.

Q: Dont use Ai, USE pencil and paper An RSA cipher has public key pq = 65 and e = 7. (a) Translate the…

A: Step 1Step 2 Step 3 : Step 4

Q: Use the affine cipher to decrypt the following cipher-text EMOC with the key pair (K1, K2) = (6, 4)…

A: An example of a monoalphabetic substitution cipher is the Affine cipher, which maps each letter of…

Q: Answer the following question: Give the pros and cons for block size as it relates to the Feistel…

A: Given: Dear Student we need to explain about the pros and cons for block size as it related to the…

Q: Decrypt the message MAXLJGTEAX which was encrypted using the affine cipher: f(p) (5p+6) mod 26 =…

A: The Answer is

Q: Explain and Use Keyed columnar transposition cipher to encrypt a plaintext “Meet me at the park”…

A: Given,  The number of columns=5 Plaintext: Meet me at the park Key: Study Columnar transposition…

Q: Alice and Bob are using the ElGamal cipher with the parameters p = 173 and a = = 2. Alice makes the…

A: Thе ElGamal ciphеr is a public-kеy еncryption algorithm that is basеd on thе Diffiе-Hеllman kеy…

Q: Alice and Bob are using the EIGamal cipher with the parameters p 97 and a = 5. Alice makes the…

A: ElGamal cryptosystem is the public-key cryptosystem. The generation of Crypto Key in ElGamal is as…

Q: Use the modified Caesar cipher described in the assignment instructions to decrypt the following:…

A: Decrypt the following ciphertext using caesar cipher technique: Ciphertext:  NHUMJNXDTIKey: 5

Q: Decrypt "RXJFKZYH" if it is known to have been encrypted with the affine cipher and c→J and k→N are…

A: The process of encryption involves transforming plaintext, or readable data, into ciphertext, which…

Q: For this problem you will perform RSA encryption and decryption with p = 13, q = 17, and e = 5 (not…

A:

Q: Decrypt "FYDQAIRR" if it is known to have been encrypted with the affine cipher and c→M and k→C are…

A: The Affine cipher is a type of substitution cipher that involves both multiplication and addition…

Q: You are given the cipher text: LFKVKQRU produced with a Hill digraphic cipher. You know that the…

A: Given chipher text LFKVKQRU All 2x2 matrix with values between 0 and 9 have been computed, only best…

Q: Suppose that you have received the following encrypted message from your friend, ciphertext…

A:

Q: The following ciphertext is encrypted using a monoalphabetic substitution cipher. Use the frequency…

A: To decrypt a monoalphabetic substitution cipher using frequency analysis, we need to identify the…

Q: The following text is encoded using Caesar cipher "Zbudhf" find the key and the corresponding…

A: In Caesar cipher, each alphabet is substituted by some other alphabet in such a way that every…

Q: Find the decryption key for the affine cipher with n=26, a=5 and b=8. Encrypt the message with the…

A: Required:   Find the decryption key for the affine cipher with n=26, a=5 and b=8. Encrypt the…

Q: a. Mention the drawback of Mono alphabetic cipher. b. Which Cipher is used to resolve the issue with…

A: Drawback of Mono Alphabetic Cipher:   A mono-alphabetic substitution cipher provides a very (too)…

Q: he textbook states “Indeed, the Vigenere cipher can be shown to be secure if the key is as long as…

A: The Vigenère cipher:It is  polyalphabetic substitution cipher. It  is similar to a monoalphabetic…

Q: The following text was encrypted using Affine Cipher. Find the plain-text if you know that the…

A: The affine cipher is a cipher, where each letter in an alphabet is mapped to its numeric equivalent

Q: Practice using multiplicative ciphers to encode and decode a message:   1. Find quote that you…

A: Ans:) Multiplicative ciphers are used to encrypt and decrypt the messages by using the alphabets and…

Q: Use the Vigenère cipher with the keyword 'tablet' to encrypt the following sentence: "Programs".…

A: Given Data Values Use the Vigenère cipher with the keyword 'tablet' to encrypt the following…

Q: Explain and Use Keyed columnar transposition cipher to encrypt

A: The answer is

Q: You intercept the ciphertext ’ JVCPK’. Knowing that the ciphertext was obtained using a Shift…

A: Ciphertext refers to the encrypted form of a message or data that has been transformed using an…

Q: The cipher text “WKLV PHVVDJH LV QRW WRR KDUG WR EUHDN" was produced using a Caesar cipher on a…

A: In caesar cipher, for a key k, we decrypt by reducing each letter by k. So for key = 1, B will…

Q: In Affine cipher, imagine the plain text is SUN and a=3 and b=8 are the two numbers for the key.…

A: The affine cipher is a type of monoalphabetic substitution cipher, where each letter in the…

Q: Based on Hill cipher algorithm, if the decryption key is -2 2-5 17-11 11 1 13-12 In the case that we…

A: #include <iostream>using namespace std; void getKeyMatrix(string key, int keyMatrix[][3]){ int…

Q: a) Using S-DES reverse cipher, decrypt the ciphertext = 1001 0001 with round keys, K₁ 1010 1101 and…

A:

Q: (c) The following table provides all possible block pairs of plaintext/ciphertext when using some…

A: To decrypt the ciphertext C=010001110111, we need to find the corresponding plaintext that was…