The ciphertext "einnd tdkng" is obtained using the substitution cipher with the key below. What is the plaintext? plain alphabet : a bcde fg hijklm n opqrstuv w x y z cipher alphabet: p hq gi u m e a ylno fd x jkr c vst z w b
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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?Write a program in Python to decode the cipher text following the parameters: Cipher Text: "Epmv efsgls oetgvburtd blh drqxv oygeraq ev yvja tg guvpuaes rcgtwqxppivot srocmth." Output should be: Plaintext and Key Use the alphabet: abcdefghijklmnopqrstuvwxyz Key Length: <= 15 (Vigenere Cipher)E x e r c i s e • 1 : Apply frequency test to verify the randomness of the output of the following text: 1. The following plaintext: In cryptography, a transposition cipher (also known as a permutation cipher) is a method of encryption which scrambles the positions of characters (transposition) without changing the characters themselves. Transposition ciphers reorder units of plaintext (typically characters or groups of characters) according to a regular system to produce a ciphertext which is a permutation of the plaintext. They differ from substitution ciphers, which do not change the position of units of plaintext but instead change the units themselves. Despite the difference between transposition and substitution operations, they are often combined, as in historical ciphers like the ADFGVX cipher or complex high-quality encryption methods like the modern Advanced Encryption Standard (AES). laintexts can be rearranged into a ciphertext using a key, scrambling the order of…
- In python Create a program that will take in an input of ASCII characters and distance value to encrypt and print the result. The program should loop through the length of the string and take the ASCII value to add the distance integer value to it. If the resulting character’s ASCII value is greater than 127, the cipher value should be set to the distance – (127 – ASCII value + 1).In the previous modules, you were introduced to the contributions of various scientists in the development of early astronomical concepts. As a review, use the Pigpen cipher below to decode the words listed in the table. Choose from the options below the corresponding description of the decoded words. Write your answer in alphabetical order. ABC JKL S DE F W XXY GHI V Words for Decoding Decoded Words Description On VELV>TL D>EL LEA FOLA Caesar cipher is a simple substitution cipher based on the idea of shiftingeach letter of the plaintext message a fixed number (called the key) ofpositions in the alphabet. For example, if the key value is 2, the word"Sourpuss" would be encoded as "Uqwtrwuu." The original message canbe recovered by "reencoding" it using the negative of the key.Write a program that can encode and decode Caesar ciphers. The input to the program will be a string of plaintext and the value of the key.The output will be an encoded message where each character in the original message is replaced by shifting it key characters in the Unicode character set. For example, if ch is a character in the string and key is theamount to shift, then the character that replaces ch can be calculated as:chr (ord(ch) + key) .A Caesar cipher is a simple substitution cipher based on the idea of shifting each letter of the plaintext message a fixed number (called the key) of positions in the alphabet. For example, if the key value is 2, the word "Sourpuss" would be encoded as "Uqwtrwuu." The original message can be recovered by “reencoding" it using the negative of the key. Write a program that can encode and decode Caesar ciphers. The in- put to the program will be a string of plaintext and the value of the key. The output will be an encoded message where each character in the orig- inal message is replaced by shifting it key characters in the Unicode char- acter set. For example, if ch is a character in the string and key is the amount to shift, then the character that replaces ch can be calculated as: chr (ord (ch) + key). 62Python The Dan Cipher works like this: shift the first lowercase character to the right by 1, the second lowercase character to the right by 2, and so on. Characters that are not lowercase characters are not changed. Write a program that takes a string and prints the result of applying the Dan Cipher.Using Python, Many user-created passwords are simple and easy to guess. Write a program that takes a simple password and makes it stronger by replacing characters using the key below, and by appending "q*s" to the end of the input string. i becomes ! a becomes @ m becomes M B becomes 8 o becomes . Ex: If the input is: mypassword the output is: Myp@ssw.rdq*sEncode 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 = 49A simple and very old method of sending secret messages is the substitution cipher. You might have used this cipher with your friends when you were a kid. Basically, each letter of the alphabet gets replaced by another letter of the alphabet. For example, every 'a' get replaced with an 'X', and every 'b' gets replaced with a 'Z', etc. Write a program thats ask a user to enter a secret message. Encrypt this message using the substitution cipher and display the encrypted message. Then decryped the encrypted message back to the original message. You may use the 2 strings below for your subsitition. For example, to encrypt you can replace the character at position n in alphabet with the character at position n in key. To decrypt you can replace the character at position n in key with the character at position n in alphabet. Have fun! And make the cipher stronger if you wish! Currently the cipher only substitutes letters - you could easily add digits, puncuation, whitespace and so forth.…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.SEE MORE QUESTIONS