The public keys are listed in the collowings (nexadecimal). We also provide the private key a to help you verify your encryption result. DCBFFE3E51F62E09CE7032E2677A78946A849DC4CDDE 3A4D0CB81629242FB1A5 n = e = 010001 (this hex value equals to decimal 65537) M = A top secret! d = 74D806F9F3A62BAE331FFE3F0A68AFE35B3D2E4794148AACBC26AA381CD7D30D Please decrypt the following ciphertext C, and convert it back to a plain ASCII string. с = 8C0F971DF2F3672B28811407E2DABBE1DA0FEBBBDFC7DCB67396567EA1E2493F You can use the following python command to convert a hex string back to to a plain ASCII string. ("4120746f702073656372657421".decode("hex"))' $ python -c 'print A top secret!

The public keys are listed in the collowings (nexadecimal). We also provide the private key a to help you verify your encryption result. DCBFFE3E51F62E09CE7032E2677A78946A849DC4CDDE 3A4D0CB81629242FB1A5 n = e = 010001 (this hex value equals to decimal 65537) M = A top secret! d = 74D806F9F3A62BAE331FFE3F0A68AFE35B3D2E4794148AACBC26AA381CD7D30D Please decrypt the following ciphertext C, and convert it back to a plain ASCII string. с = 8C0F971DF2F3672B28811407E2DABBE1DA0FEBBBDFC7DCB67396567EA1E2493F You can use the following python command to convert a hex string back to to a plain ASCII string. ("4120746f702073656372657421".decode("hex"))' $ python -c 'print A top secret!

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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Q7: Using the same notations as in the lecture, e.g., p and q are the two primes and e and d are the public key and private key, respectively, p = 5, q = 13 and e= 5. Using the phi(n) that you found in question 6 and the Extended Euclidean algorithm yields d = 29. What is the cipher text C when encrypting M = 17?
Let M be the plaintext message M = MALAYSIA and the private key, K || ISSOGOOD a) Represent your plaintext binary number as a form of a block, using the DES encryption technique (2 equal blocks). b) Using the initial permutation (table is provided below), please provide your plaintext output. Initial Permutation Initial Permutation 58 50 42 34 26 18 10 02 60 52 44 36 28 20 12 04 62 54 46 38 30 22 14 06 64 56 48 40 32 24 16 08 57 49 41 33 25 17 09 01 59 51 43 35 27 19 11 03 61 53 45 37 29 21 13 05 63 55 47 39 31 23 15 07
1- A simple encryption method is being used to encrypt a small number (called the secret number). The method by which this encryption works is as follows: I. Choose a random seed number II. Calculate the key by multiplying the seed with the secret under modulus 7 III. Finally, multiply the key with the secret to get the encrypted secret Example: If our secret number was 45Randomly choose seed = 6 key = secret x seed (mod 7) = 45 x 6 (mod 7) = 4Encrypted Secret = key x secret = 45 x 4 = 180 Based on this encryption method, when choosing the random seed, show which number should not be used, because it would result in the Secret and the Encrypted Secret being the same.
example: use the above key, if the letter "a" appeared in the message, it would be replaced with "g" since "g" in the adjacent letter. Return the encrypted message. Examples encrypt("ab c", "abc ab") → "ba cba" encrypt("otorhinolaryngological", "My name is Paul") "Mr olme
w = ONote: The notation from this problem is from Understanding Cryptography by Paar and Pelzl. Consider the LFSR represented by the polynomial x* + x + 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, po = 1). %3D %3D %3D
Encode the number using the given public key. Encode the number M = 14 using the public key n = 77 and e = 13. Assume you are encoding the number using the RSA cryptosystem. Note: You can use the Modular Exponentiation calculator to help with the calculation. a 46 (mod 77), encoded number = 46 47 (mod 77), encoded number = 47 48 (mod 77), encoded number = 48 d. 49 (mod 77), encoded number = 49
Encrypt Caesar cipher is a kind of substitution cipher. Instead of using a substitution table, the alphabets are rotated by a number (a key). For example, if the key is 3, plaintext alphabet a would become d, and plaintext alphabet z would become c. Write a program that implements the Caesar Cipher. You program will first prompt for the key and then for the mode (E for encryption and D for decryption) and finally for the message to be encrypted / decrypted. Your program will then output the encryption / decryption message. For this question, the input message may consists of any character, the program should encrypt or small letter case a to z only. All other characters should be kept intact after encryption or decryption.
Program Specifications: Your task is to write a program that can decrypt a message that has been encoded using a Caesarcipher. Stated another way, you need to find the “shift” for the cipher. Once you have the shift,you know the mapping so you can decrypt the message. the encryption code. use python. def encrypt(text, r): #abcdefghijklmnopqrstuvwxyzresult = ''for i in range(len(text)): # Hello Khoorchar = text[i]if char.isupper():result = result + chr((ord(char) + r - 65 ) % 26 + 65)else:result = result + chr((ord(char) + r - 97) % 26 + 97)return result while True:msg = input("\n\tEnter a String / message e.g. Today is Thursday ")rotation = int(input("\n\tEnter number of rotation e.g. 3 "))print("\n\tOriginal Message is==> ",msg," with rotation ",rotation, " The CypherText ", encrypt(msg,rotation)) No hand written and fast answer with explanation
You may use a software to do calculations but you have to write down the details. The correspondence of letters table: A 01 B C D E F GH I J K L M 02 03 04 05 06 07 08 09 10 11 12 13 TU V W X Y N O P Q R 14 15 16 17 18 Z space S 19 20 21 22 23 24 25 26 00 4. Decipher the message "NUMBER", which was enciphered using the blocked cipher that sends the plaintext block (x₁, x2) into the ciphertext block (y₁, y2) with 2 (22) = (₂¹9) (2) mod 27.
Substitution ciphers are encryption/decryption algorithms that replace one letter or number with another. The first attested use of a substitution cipher in military affairs was by Julius Caesar, described by him in Gallic Wars (cf. Kahn pp83-84). In caesar cipher , you replace each letter by 3rd letter on. If it is out of bound (later than Z), then round to the head (letter A) and continue the shift. For example:meet me after the toga party PHHW PH DIWHU WKH WRJD SDUWB Please write a program in Java to implement the Caesar Cipher: a. Implement the encryption algorithm. Ask the user to input one all lower case normal sentence (called plaintext) using the nextLine method, and then output the encrypted text (called ciphertext). b. Implement the decryption algorithm. Ask the user to input one encrypted sentence (i.e. ciphertext) using the nextLine method, and then output the decrypted text (i.e. plaintext).
Encrypt The following correspondence between letters and numbers is used in the Caesar cypher. a b c d f h i j k lm n t V W e g 6. u y 0 1 2 3 4 7 8. 9. 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Encrypt the animal name zebra with the Caesar cypher with a key of 3. What is the encrypted animal name (enter a string of letters with no spaces)? Decrypt An animal name was encrypted with the scheme described in the previous question (it was encoded with the key 3). The encrypted animal name is pduprw .What is the animal name?
1- A simple encryption method is being used to encrypt a small number (called the secret number). The method by which this encryption works is as follows: I. Choose a random seed number II. Calculate the key by multiplying the seed with the secret under modulus 7 III. Finally, multiply the key with the secret to get the encrypted secret