Question 1 Study the scenario and complete the question(s) that follow: Ceasar Cipher The Caesar Cipher technique is one of the earliest and simplest method of encryption technique. It's simply a type of substitution cipher, i.e., each letter of a given text is replaced by a letter some fixed number of positions down the alphabet. For example with a shift of 1, A would be replaced by B, B would become C, and so on. The method is apparently named after Julius Caesar, who apparently used it to communicate with his officials.

Question 1 Study the scenario and complete the question(s) that follow: Ceasar Cipher The Caesar Cipher technique is one of the earliest and simplest method of encryption technique. It's simply a type of substitution cipher, i.e., each letter of a given text is replaced by a letter some fixed number of positions down the alphabet. For example with a shift of 1, A would be replaced by B, B would become C, and so on. The method is apparently named after Julius Caesar, who apparently used it to communicate with his officials.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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The definition of a Shift Cipher can be expressed as follows:Def. Let x, y, k ∈ Z26 with the encryption operation as ek(x) ≡ x + k mod 26 and thedecryption operation as dk(y) ≡ y - k mod 26.Given the provided letter encoding, what would be the encoding of the plaintext word ATTACKafter applying a shift cipher with a k=17?
Explain this more What is the tradeoff however with each pass? Answer here: Minimum 200 words addressing tradeoffs. I’m understanding this question, in the way that if we apply ciphers multiple times using the same key then it will either completely negate encryption an even number of encryptions attempts or only apply it once for an odd number of encryption attempts. If we have a secure password, then we can focus on protocols and systems instead of passwords
Let k=( 4 1 3 2) be the encryption and key k = (2 4 3 1) be the decryption key used in a transposition cipher. Show all the steps to decrypt the following ciphertext using the keyed approach: “XYSEESRU”
Can you explain more about this question 1. How many passes should you do if the keys were all different? Answer here: Minimum 200 words where you discuss the specific implications (i.e., I don’t want a hunch or opinion, base it on facts…maybe use math). I’m understanding that any modern cipher should be secure with one pass. We should have only one pass because any modern cipher should be secure with one pass. The ciphertext is also known as encrypted or encoded information because it contains a form of the original plaintext that is unreadable by a human or computer without the proper cipher to decrypt it. This process prevents the loss of sensitive information via hacking.so, we do have only one pass.
Question # 2: Use the affine cipher to decrypt the following cipher-text EMOC with the key pair (K1,K2) = (6, 4) in modulus 26. Remember: i need a Mathematics solution not computer program You must show all the steps of your work
Suppose you were given a number of different ciphertexts and you are told that they are each encryptions of plaintexts using a Caesar cipher-type encryption but with different keys and different plaintext languages from around the world. You are asked to try to work out the most likely language of each ciphertext. Explain how you would approach this problem.
The following is related to the Hill cipher. A pair of plaintext and itscorresponding ciphertext is provided below, so find the key (which is a 3x3 matrix). Plaintext: thisquestionisabouthillcipher → Ciphertext: fhicqumstyonysadoufhihlcyphmr
Let's say you generated RSA keys and you chose p=59, q=43, 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 99 as the ciphertext they created using your public key, what is the plaintext you get when you use your private key to decrypt? What is e?____ What is d?____ What is the decrypted value?____
1. Suppose that we use a substitution cipher to encrypt an English word, from which we obtain the ciphertext is “AUXXME”. Which of the following words is possibly the plaintext? (Hint: In a substitution cipher, we replace each letter of the plaintext with another letter) A. greedy B. funny C. secret D. cheese 2. Which of the following statements are incorrect? A. Cryptographic systems tend to involve both an algorithm and a secret value. B. To secure systems, it is more efficient to update algorithms than updating keys. C. Often a scheme can be made more secure by making the key longer. D. We can always change the key length to better secure systems, no matter using which cryptographic algorithms. E. In a secret-key cryptosystem, secret keys can be used for both encryption and decryption. 3. Which of the following statements are incorrect about a cryptographical hash function? A. The input size can be arbitrary and the output size is fixed B. Given the input, the output should…
What is the difference between a block cipher and a stream cipher? What is the difference between an unconditionally secure cipher and a computationally secure cipher? What is the difference between a monoalphabetic cipher and a polyalphabetic cipher? Why is it important to study Feistel ciphers?
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Under what conditions (specify two) can a cipher be broken, meaning that an attacker candecipher the encrypted message without having the key? Support your reasoning withexample(s).