Determine the encryption and decryption codes of the indicated messages. A) Apply Shift Cipher to encrypt the message "God is good", K=12 B) Apply Shift Cipher to decrypt the messages AMLEPYRSJYRGMLQ, K=24
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- Suppose that in a long ciphertext message the letter occurred most frequently, followed in frequency by. Using the fact that in the -letter alphabet, described in Example, "blank" occurs most frequently, followed in frequency by, read the portion of the message enciphered using an affine mapping on. Write out the affine mapping and its inverse. Example 2 Translation Cipher Associate the letters of the "alphabet" with the integers. Let and define the mapping by where is the key, the number of positions from the plaintext to the ciphertext. If our alphabet consists of through, in natural order, followed by a blank, then we have "letters" that we associate with the integers as follows:Suppose that in an RSA Public Key Cryptosystem, the public key is. Encrypt the message "pay me later” using two-digit blocks and the -letter alphabet from Example 2. What is the secret key? Example 2 Translation Cipher Associate the letters of the "alphabet" with the integers. Let and define the mapping by where is the key, the number of positions from the plaintext to the ciphertext. If our alphabet consists of through, in natural order, followed by a blank, then we have "letters" that we associate with the integers as follows:a. Excluding the identity cipher, how many different translation ciphers are there using an alphabet of n "letters"? b. Excluding the identity cipher, how many different affine ciphers are there using an alphabet of n "letters," where n is a prime?
- Once the length of the key string of a Vig`enere cipher is known, explain how to determine each of its characters. Assume that the plaintext is long enough so that the frequency of its letters is reasonably close to the frequency of letters in typical English text.Encrypt the message AT TEN HEAD NORTH TO TRENCHES using a tabular transposition cipher with rows of length 4 characters. If necessary, pad the message with A's.Suppose that the most common letter and the second most common letter in a long ciphertext produced by encrypting a plaintext using an affine cipher f (p) = (ap + b) mod 26 are Z and J, respectively. What are the most likely values of a and b?
- The ciphertext letter for T when the congruence is C =( P + 10 ) mod 26 isSuppose that a password for a computer system must have at least 6, but no more than 9 characters, where each character in the password is a lowercase English letter, or an uppercase English letter, or a digit, or one of the five special characters * , < , > ! and # (a) How many different passwords are available for this computer system? (b) How many of these passwords contain at least one occurrence of at least one of the five special characters? (c) Using your answer to part (b), determine how long it takes a hacker to try every possible password, assuming that it takes one microsecond for a hacker to check each possible password. Please solve all 3 sub questionsDetermine whether the given statements illustrate a Combination or Permutation. 1. Determining top three winners in a Math Quiz Bee. 2. Forming triangles from 5 distinct points with no three of which are collinear. 3. Selecting 5 basketball players out of 10 team members for the different positions. 4. Creating a password for your smartphone. 5. Forming a committee of 5 members from 20 people.