Use the RSA cipher with public key n = 713 = 23 · 31 and e = 43 to decrypt the ciphertext 675 089 089 048 and find the original messages. Consider d=307 and Performs all steps show all the step on how you solved it use pencil and paper. dont use AI

You're preparing the message below to the Kingdom of the North but can't let it be un- derstood by any polar bears or meese that may intercept it. Encode it with the RSA algorithm using the public key (161, 31). "FEAR THE GEESE"

Set up an RSA public-key cryptosystem using primes p = 91, q = 73 and a public exponent of 997 by finding the appropriate (positive) private exponent using the extended euclidean algorithm given the table below and identities: ri = ri+1qi+1 + ri+2,          si+2 = si − qi+1si+1       and           ti+2 = ti − qi+1ti+1       si(a) +ti(b)=ri i ri qi si ti 0 a x 1 0 1 b   0 1 2         3         4           What is the numerical value for n? 6643  What is the numerical value for a? 6480   What is the numerical value for b? 997 What is the numerical value for z? 997 What is the numerical value for q3? 7  What is the numerical value for s3? -2  What is the numerical value for w? 13 is my calculated value right for the one in bold?

The key to cracking a substitution cipher was first discovered by Arab scholars in the ninth century, but it was not widely known in the West until the fifteenth century. Once frequency analysis of ciphers became widespread, the plain substitution cipher became useless. To fix the problems in the substitution cipher, Blaise de Vigenère invented the strategy of using multiple letter mappings. Rather than using one key for the whole message, Vigenère’s idea was to use a different key for each letter of the message. Using a different key for each letter makes the frequency analysis much more difficult.   The key to the Vigenère cipher is the Vigenère square. The rows shown here are simple rotations of the alphabet. Each row in the table shifts the letters of the alphabet one place to the left. When a letter shifts out of the first .   The idea is to have the message we want to encode: secretmessage Alongside a word we will use to encrypt: encryptencrypt   Plaint text s e c r…

A B C D 0 1 N 13 111 0 P Q 14 15 16 17 F5 E 4 D 3 S U225 E R F G H I 19 V 6 7 8 T U 18 19 20 21 22 23 24 25 1932 J K L M 10 11 12 W ✗ Y Ꮓ (Show your work.) Decrypt the ciphertext "tyvq" using Affine Cipher in English alphabet with a = 7; b =22 encryption functions is f(p) = ☐ A) hens (7p+22) mod 26 B) hect C) zine D) helo

make a code , if you can uses mathlab keep basic code no if or return

Note: The notation from this problem is from Understanding Cryptography by Paar and Pelzl. Consider the LFSR represented by the polynomial x4+x2+1x4+x2+1. What are the tap bits of the LFSR? Please enter your answer as unspaced binary digits (e.g. 010101 to represent p5=0,p4=1,p3=0,p2=1,p1=0,p0=1p5=0,p4=1,p3=0,p2=1,p1=0,p0=1).

Your task is to design automated solvers for the shift and Vigenere ciphers. You must use C as the under- lying programming language, in order to get prepared for the following labs. Each solver should be completely automated, i.e., upon reading a text ,l.e. containing the target ciphertext (given as command-line argument), it should print the encryption key and the decrypted plaintext without any user interaction. Test your code on the following ciphertexts, and answer these questions: 1. What is the key of the cipher? 2. What is the decrypted plaintext?Shift Cipher - Decrypt the following ciphertext:…

Let (M, C, e, d, Ke, Ka) denote the RSA cryptosystem with public key (s, n) = (5, 26051) and private key t = 5141. (a) Compute C = e(200, (5, 26051)). (b) Compute M = d(2,5141)

Let's say you generated RSA keys and you chose p=53, q=41, and the smallest encryption exponent that qualifies for this p and q. (You will have to follow the key generation algorithm to fill in the details.) If someone gives you 343 as the ciphertext they created using your public key, what is the plaintext you get when you use your private key to decrypt? Also note that you can test your answer by encrypting it and making sure you get 343 back.