atakoute_CS3626Sp01_Assignment03

Encrypt The following correspondence between letters and numbers is used in the Caesar cypher. a b d e f i k lm n o r u V W X y z 1 2 3 4 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Encrypt the animal name zebra with the Caesar cypher with a key of 25. What is the encrypted animal name (enter a string of letters with no spaces)? Save Submit You have used 0 of 1 attempt Decrypt An animal name was encrypted with the scheme described above. The encrypted animal name is azmchbnns . What is the animal name? Save

Difficult Intro to Elementary Number Theory Homework problem. This is not a computer programming homework problem.

Q7: Using the same notations as in the lecture, e.g., p and q are the two primes and e and d are the public key and private key, respectively, p = 5, q = 13 and e= 5. Using the phi(n) that you found in question 6 and the Extended Euclidean algorithm yields d = 29. What is the cipher text C when encrypting M = 17?

cryptography

Encrypt The following correspondence between letters and numbers is used in the Caesar cypher. a b c d f h i j k lm n t V W e g 6. u y 0 1 2 3 4 7 8. 9. 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Encrypt the animal name zebra with the Caesar cypher with a key of 3. What is the encrypted animal name (enter a string of letters with no spaces)? Decrypt An animal name was encrypted with the scheme described in the previous question (it was encoded with the key 3). The encrypted animal name is pduprw .What is the animal name?

You are given the following parameters in RSA cryptosystem: p = 11, q = 13, e = 13         a) Find the integer d.         b) List down the public key and private key. You need to encrypt the plaintext message, M = OF.       c) Convert this message to value according to ASCII table.      To encrypt this message, you can either combine the value, or    separate it into the blocks of 2 digits (Hint: it must satisfy the condition M < n).       d) Encrypt and decrypt the message OF.       e) If the decimal value (not character) of ciphertext is 188267, decrypt this value and convert it to an appropriate message according to the ASCII table.

E x e r c i s e • 1 :  Apply frequency test to verify the randomness of the output of the following text: 1. The following plaintext: In cryptography, a transposition cipher (also known as a permutation cipher) is a method of encryption which scrambles the positions of characters (transposition) without changing the characters themselves. Transposition ciphers reorder units of plaintext (typically characters or groups of characters) according to a regular system to produce a ciphertext which is a permutation of the plaintext. They differ from substitution ciphers, which do not change the position of units of plaintext but instead change the units themselves. Despite the difference between transposition and substitution operations, they are often combined, as in historical ciphers like the ADFGVX cipher or complex high-quality encryption methods like the modern Advanced Encryption Standard (AES). laintexts can be rearranged into a ciphertext using a key, scrambling the order of…

i need the answer quickly

Simple python code

Python Simple program please Thank you ??

2

Please help  Add c program for encrypt decrypt using  Shift cipher.  Only small letters in string

Toy encryption scheme. It encrypts plaintexts that consist of only uppercase letters and the underscore character (27 characters total): ABCDEFGHIJKLMNOPQRSTUVWXYZ_ Note that the underscore character is part of the alphabet and will also be encrypted. A key in this scheme consists of 4 digits, each from 0 to 9. Each digit tells how much to shift one character, that is, change it to the character that many positions later in the alphabet. If the shift goes past '_', then we wrap around to the beginning. The key is applied separately to each group of 4 letters in the message. For example, if the message HI_SALLY is encrypted with the key 2407, the H would be shifted by 2, the I by 4, the underscore by 0, and the S by 7. Then we would start over with the first digit of the key, shifting A by 2, L by 4, and so on. So the ciphertext would be: JM_ZCPLE. Give the encryption of the following messages with the key 2641. a. SELL_GME b. FRANZ_IS_MOLE c. DEPLOY_ALL_DIVISIONS

##Encrypt the message WATCH YOUR STEP by translating the letters into numbers, applying the encryption function f(p) = (-7p+2), and then translating The numbers back into letters

Complete the function encrypt, which takes an unencrypted, plaintext message called plaintext and encrypts it according to the following algorithm. The function then returns the encrypted ciphertext message. 1. Using a for-loop, swap the character at each even-indexed position with the one to its right. (Examples: abcdefg becomes badcfe; abcdefg becomes badcfeg) You'll have to carefully accomodate for even-lengthed and odd-lengthed strings. 2. Then, using another for-loop, replace every uppercase letter with its lowercase equivalent, and replace every lowercase letter with its uppercase equivalent. 3. (May be combined with the loop in the previous step in the code.) Except for the character o, replace each digit character with 10 minus that digit. (Examples: 2 becomes 8, 9 becomes 1.) Hint: use ord and/or chr and/or str and/or int instead of a 10-way if- statement! Examples: Function Call encrypt('abCDefGHIJKLMnopQ') encrypt('ABCdefGHIjkL') encrypt('0123456789') encrypt('123456789')…

Using the ∑ = {0, 1}, Write the regex for the following descrip on: 1. {w | w has an even number of 0s and each 0 is followed by at least one 1} 2. {w | w doesn’t contain 01}

4. The following algorithm gives a test if a given number is prime. Write a script to test it. Then try it out on the numbers: 4058879 (not prime), 193707721 (prime): (a) Input P (b) Initialize N to 3 (c) Find remainder R when P is divided by N (d) While R#0 and N< VP repeat: Increase N by 2 Find R when P is divided by N (e) If R#0 then P is prime Else P is not prime (f) Stop

Please write the code in python. CountRepetitions that takes a ciphertext as an argument and returns the total number of repetitions between all 16-byte blocks

Experiment 1: IMPLEMENTATION OF CAESAR CIPHER Objective: To implement the simple substitution technique named Caesar cipher using C+ language. Theory: To enerypt a message with a Caesar cipher, each letter in the message is changed using a simple rule: shift by three. Each letter of the message is shifted a fixed distance (3 for example) down the alphabet, A becomes D, B becomes E, and so on. For the last letters, we can think of alphabet as a circle and "wrap around", W becomes Z. X becomes A, Y becomes B, and Z becomes C. To change a message back, cach letter is replaced by the one three before it. Example ABCDEFGHIJKLMNOPQRSTUVWXYZ t t t t t t t t ttt t t t t t t tt t t t t t t ft DEFGHIJKLMNOPQRSTUVW XY Z ABc) digorithm STEP-1: Read the plain text from the user. STEP-2: Read the key value from the user. STEP-3: If the key is positive then encrypt the text by adding the key with each character in the plain text. STEP-4: Else subtract the key from the plain text. STEP-5: Display the…