This question concerns block cipher modes. We will use a simple affine cipher, which can be expressed in C as follows. char cipherfunsigned char block, char key) return (key+11'block)%256; The inverse of this cipher is shown below. char inv_cipher(unsigned char block, char key) (1 163 is the inverse of 11 mod 256 return (163 block-key+256)%256; Note that the block size is 8 bits, which is one byte (and one ASCII charactor). We will work with the fixed key Ox08. We now decrypt various ciphertexts using modes for this cipher. In every case in which the mode requires an IV, the IV will be OXAA. In the case of CTR mode, we use a (nonce || counter) arrangement in which the nonce is the left 5 bits of OKAA and the counter is a 3 bit counter that begins at 0. In all of th- problems given below, one character is one block. Each character of the plaintext should be regarded as its corresponding ASCII code. The ciphertext is given in hexadecimal. a) Decrypt the ciphertext '212C330F184EBB using CTR mode. Please enter your answer in ASCII characters (aka worda).

use python please

What will be the ciphered text corresponding to “ALGORITHM” if bifid cipher is used for encryption with key as “KEY” with a period as 5? a) SBPISZTKZH b) PLNSOWGKQM c) SELFQEXBHM d) YFSGWNFBW

21. RSA problem: given plaintext P, e, prime numbers p, q, compute ciphertext C. Decrypt C and verify you get plaintext P back.

This question concerns block cipher modes. We will use a simple affine cipher, which can be expressed in C as follows. char cipher(unsigned char block, char key) { return (key+11*block)%256; } Note that the block size is 8 bits, which is one byte (and one ASCII character). We will work with the fixed key 0x08. We now encrypt various plaintexts using modes for this cipher. In every case in which the mode requires an IV, the IV will be OXAA. In the case of CTR mode, we use a (nonce || counter) arrangement in which the nonce is the left 5 bits of OXAA and the counter is a 3 bit counter that begins at 0. In all of the problems given below, one character is one block. Each character of the plaintext should be regarded as its corresponding ASCII code. a) Encrypt the plaintext "spider" using CTR mode. Please enter your answer in hex. (Please do **not** enter an 0x, as this has been done.) Ox b) Encrypt the plaintext "spelling" using ECB mode. Please enter your answer in hex. Ox c) Encrypt the…

Please give me a step by step solution for this question, using only the regular c-instructions offered with hack assembly language.

This question concerns block cipher modes. We will use a simple affine cipher, which can be expressed in C as follows. char cipher(unsigned char block, char key) { return (key+11*block)%256; } Note that the block size is 8 bits, which is one byte (and one ASCII character). We will work with the fixed key 0x08. We now encrypt various plaintexts using modes for this cipher. In every case in which the mode requires an IV, the IV will be OxAA. In the case of CTR mode, we use a (nonce || counter) arrangement in which the nonce is the left 5 bits of OxAA and the counter is a 3 bit counter that begins at 0. In all of the problems given below, one character is one block. Each character of the plaintext should be regarded as its corresponding ASCII code. a) Encrypt the plaintext "lippo" using CTR mode. Please enter your answer in hex. (Please do **not** enter an Ox, as this has been done.) Ox b) Encrypt the plaintext "lippi" using ECB mode. Please enter your answer in hex. Ox c) Encrypt the…

AO A B C D E F G H I J K L M 0 1 2 3 4 5 6 7 8 9 10 11 12 N 0 P Q R S T U V W X Y Z 13 14 15 16 17 18 19 20 21 22 23 24 25 (Show your work.) Encrypt the message "TYVQ" using Affine Cipher in English alphabet with a = 7; b =22 and encryption function is f(p) = (7p+22) mod 26 A) hens B) helo C) zine D) zict

Can you please show the shifts for the encrypt & decrypt in this format?  For example, like this : Example:ABCDEFGHIJKLMNOPQRSTUVWXYZ Row 1FGHIJKLMNOPQRSTUVWXYZABCDE Row 2 If the plaintext to encrypt is:THIS IS THE ANSWER The ciphertext becomes:YMNX NX YMJ FSXBJW This is for me to help understand and to redo the problem for studying.  Thank you!!

In C:   Write a simple "brute force" decrypter for an autokey cipher. This program:   1. Reads in an array of characters (up to 100) and converts them to their ASCII values.   2. "Decrypts" the array for each modulo value (the spacebar and all letters, 27 total).   3. Determines the modulo value that has the second-most number of the character 'E' in the decrypted array.   4. Prints the "decrypted" array corresponding with the modulo value determined in step 3.