Suppose we are using a method of encryption that does as much as possible to hide any patterns of a file, including symbol frequencies. And suppose we also want to compress the same file. In terms of the compression performance (the size of compressed file), is it better to compress the file before encrypting it, or encrypt the file before compressing it? Briefly explain the reason

Q: computer system with three users: Alice, Bob, and Cindy. Alice owns file X, and Bob and Cindy can…

A: The question is asking to:Create an Access Control Matrix (ACM) for a computer system with three…

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: Suppose you are working for a secret agency of Army and based on the secret information you are…

A: Given message = We have to fight Key=3

Q: Suppose that Alice and Bob communicate using ElGamal cipher and f (p. 9. Z) is common public values.…

A:

Q: Get an understanding of the distinction between encoding and encryption.

A: Encoding and encryption are two related but distinct concepts in the field of computer science and…

Q: Exercise 2 (MAC schemes derived from block ciphers ( Let E denote the family of encryption functions…

A: we assume that it is not collision resistant, i.e. we can find a pain of messages x and y where xty…

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: Q4: Based on Hill cipher algorithm, if the decryption key is 15 3 -5 12 -7 11 20 -1 In the case that…

A: Hill cipher algorithm is an encryption algorithm to add more complexity and reliability to a data…

Q: Prove and explain in detail that the avalanche effect exists in DES algorithm.

A: GIVEN  Prove and explain in detail that the avalanche effect exists in DES algorithm. you don’t have…

Q: Consider a magnetic disk with 1000 cylinders rotating at a speed of 7200 revolutions per minute. The…

A: Given:- Total number of cylinders =1000 Number of Revolutions per minute = 7200 Sector size =1024…

Q: A ciphertext was generated using an affine cipher. The most frequent letter in the ciphertext is “C”…

A: An affinе ciphеr is a typе of substitution ciphеr that usеs two intеgеrs, callеd thе kеy, to еncrypt…

Q: The parity function is a very simple hash function producing a one-bit digest, which is 0 if the…

A: Hamming code is a bunch of error detection codes that can be utilized to distinguish and address the…

Q: Suppose we have a disk drive with the block size B=4096 bytes. An unordered file with fixed-length…

A: Given that, Block size B=4096 bytes Record size R=250 bytes Number of records r=400000

Q: Suppose we have public key encryption system with E the encryption function and Dµ the decryption…

A: Process for authenticating the message using public key k (E k ) and secret key k (Dk).

Q: (e) A file is protected by a random password consisting of n binary bits. All password combinations…

A: Answer: We need to write the what how many bits should be specified so we will see in the more…

Q: Construct an experiment to estimate the speed at which a particular computer can process an…

A: The answer for the given question is as follows

Q: We know that RSA works with numbers. Assume we want to encrypt the plaintext M=“ComputerSecurity”.…

A: RSA encryption includes utilizing a public key (e, N) to encrypt a message M, coming about in the…

Q: Find "steganographic tools" on the internet. What have you discovered thus far? One of the tools can…

A: Introduction: Below is a list of steganographic tools. OpenStego Invisible OpenPuff  Text Hide…

Q: . A security system is used to encrypt the password of a cryptocurrency wallet (crypto wallet) and…

A: There are 10 different codes and at least 6 of them are required to reconstitute the password to…

Q: (a)   What happens if the F function in each round of DES ALWAYS produces all 0’s no matter what key…

A: A) With a Mangler function that always outputs 0, each DES round just swaps L and R. So after 16…

Q: A file is encrypted by using an encryption function E and a key k. No other protection checks are…

A: Here, we have to provide a solution for the above question.

Q: (Basic ASCII Cacsar Cipher) A very ancient cryptographic technique for hiding a message was to use a…

A: // here is the code for that in matlab // get input from user using another function and call this…

Q: A number of companies have been invited to prepare and submit a tender for a contract using e-mail.…

A: Authentication steps :In computing, authentication is the process of verifying the identity of a…

Q: Suppose I have a modern symmetric cipher with 95 bits key. If I have a cryptanalysis machine that…

A: Given that, Suppose I have a modern symmetric cipher with 95 bits key. If I have a cryptanalysis…

Q: A summary of RSA algorithm is described on W10 Notes. Assume that the algorithm is used with p= 11,…

A: 1) Calculate value of n=p*q, where p and q are prime numbers.2)Calculate (n)=(p-1) *(q-1)3)Consider…

Q: Explain whether bit shiffting can be considered as a method to encrypt the file's content or to hide…

A: In which method each digit of a set of bits are moved to either right or left by a determined number…

Q: Your task is to design automated solvers for the shift and Vigenere ciphers. You must use C as the…

A: To solve the shift cipher, you can use the following steps: Iterate through all possible shifts…

Q: 1. Please apply columnar transposition cipher to encrypt the message "a digital computer is a…

A: Columnar Transposition Cipher: Columnar Transposition is the process of writing plaintext in rows…

Q: Consider a simple RSA example. To generate, say, Alice's keypair, we select the two "large" primes,…

A: The RSA key generation process involves several steps to create a secure key pair for encryption and…

Q: It is critical to have a solid understanding of the distinctions between encoding and encryption.

A: In the realm of information security, it is essential to grasp the differences between encoding and…

Q: We analyzed a program which was supposedly used for cracking some cryptographic algorithms. During…

A: a) Based on the given information, we can assume that the program has an exponential time complexity…

Q: The text is encoded with a transposition cipher, as follows: the plaintext is written row-wise…

A: As no programing language is mentioned I am solving it using C++

Q: What is the maximum amount of time that it would take a computer that can test  keys per second to…

A: The only known practical attack on AES-256, when used in the way that ScramBox does, is called a…

Q: Please explain the problem in detail so that I can understand.

A: 1. Monoalphabetic Cipher Given Message:   "This is a secret message" Now we have to encrypt the…

Q: A.Given p=25, q=9, and e=7, generate the public key (n,e) and the private key (n,d) using the RSA…

A: Solution:   Given,   A.Given p=25, q=9, and e=7, generate the public key (n,e) and the private key…

Q: Assume the cryptanalist has two pairs (x, y1) and (î, y2) such that yl = DES(K,r) and y2 = DES(P a…

A: The term cryptography is supposed to be gotten from the Greek words krypto, and that implies stowed…