et M be the plaintext message M = MALAYSIA and the private key, K = ISSOGOOD, Represent your plaintext binary number as a form of a
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- Let M be the plaintext message M = MALAYSIA and the private key, K = ISSOGOOD, Represent your plaintext binary number as a form of a block, using the DES encryption technique (2 equal blocks). Do Not Copy and Paste from other place.
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- You are given the following parameters in RSA cryptosystem: p = 11, q = 13, e = 13 a) Find the integer d. b) List down the public key and private key. You need to encrypt the plaintext message, M = OF. c) Convert this message to value according to ASCII table. To encrypt this message, you can either combine the value, or separate it into the blocks of 2 digits (Hint: it must satisfy the condition M < n). d) Encrypt and decrypt the message OF. e) If the decimal value (not character) of ciphertext is 188267, decrypt this value and convert it to an appropriate message according to the ASCII table.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 07Encrypt the word WEST using p=53 and q=71. Choose e=3. (Map A - Z to 126 and perform the encryption one letter at a time.)
- Experimenting with AES-128 symmetric key cipher.using python PART 2: you will try to use "brute force" to decrypt an encrypted message, where you only have the first 96-bits of the 128-bit secret key (last 4 bytes of the secret key are missing!) The program should be called "findk", and should deal with two files that contain the encrypted text as a stream of bytes and the first 96-bits of the key, respectively. The program should print out on standard output the missing 4 bytes of the key in hexadecimal, the decrypted message and the time it took to find the correct key.o To test this part, here is the encrypted file (ciphertext2.dat), and the first 96-bits of the key (partial-key.dat) Hint: the original message starts with the word "Salam". Answer you provided .from Crypto.Cipher import AESdef revpad(s):"""This function is to remove padding.parameters:s:strstring to be reverse padded"""k = ord(s[-1])temp = 0 # temporary variable to check paddingfor i in range(1, k): # for loop to…Experimenting with AES-128 symmetric key cipher.using python please. PART 2: you will try to use "brute force" to decrypt an encrypted message, where you only have the first 96-bits of the 128-bit secret key (last 4 bytes of the secret key are missing!) The program should be called "findk", and should deal with two files that contain the encrypted text as a stream of bytes and the first 96-bits of the key, respectively. The program should print out on standard output the missing 4 bytes of the key in hexadecimal, the decrypted message and the time it took to find the correct key.o To test this part, here is the encrypted file (ciphertext2.dat), and the first 96-bits of the key (partial-key.dat) Hint: the original message starts with the word "Salam". partial key is b'\x01{:\xec<\x8e\xfc\x8b\x19\xf8#\xc0' ciphertext2 is…4. Encryption is used to secure data messages in computer networks. One possible way of encrypting text consists of rewriting the text by including first the characters found at even indexes (starting from 0) followed by the characters stored at odd indexes, while ignoring whitespace characters. For instance, the String "Exam is fun" can be encoded using the previously explained technique as "Easfnxmiu". To be able to recover the original message based on the encrypted version of the message, some additional information should be added to the encrypted message, namely, the number of characters found at even indexes, the number of characters found at odd indexes, and the indexes at which the white space characters existed in the original message. In this way, reconsidering our previous example, the string "Exam is fun" can be encoded using the previously explained technique as "5 4 4 7 Easfnxmiu". This is particularly true since the original message had 5 characters at even indexes…
- Encryption is commonly used to disguise messageson the internet. A Caesar cipher performs a shift ofall of the characters in a string (based on their ASCIIvalues, see Table 2.1), e.g.h e l l o → m j q q tThe example shows a shift with a distance of 5characters, i.e. h(ASCII:104) → m(ASCII:109)Write a C/C++ program that asks the user to input aline of plaintext and the distance value and outputsan encrypted text using a Caesar cipher, with theASCII values range from 0 through 127. Useunderscores (ASCII: 95) to represent spacecharacters.Underscore characters should not be encrypted,and any character that is encrypted may notbecome an underscore. In this case, the charactershould be changed to the next character in theASCII table.The program should work for any printablecharacters.NB: No strings (datatype) or library functions maybe used.See Figure 2.1 for example output.[Estimate time to solve this question is 5 minutes] Вов ALICE Yes Message (m) Hash Function MD Alice public-key Alice private-key Hash Same? Function MD Public-key Decryption Public-key Encryption MD E( Private-Keyalice MD) + message It is very handy and practical to use the digital signature scheme that is shown in the scenario above as part of the network security protocol suits. But it has two very specific weaknesses that can be solved using the MAC scheme. Explain these 2 weaknesses that can be solved using the MAC scheme.Encrypt The following correspondence between letters and numbers is used in the Caesar cypher. a b d e f i k lm n o r u V W X y z 1 2 3 4 6 7 8 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 25. What is the encrypted animal name (enter a string of letters with no spaces)? Save Submit You have used 0 of 1 attempt Decrypt An animal name was encrypted with the scheme described above. The encrypted animal name is azmchbnns . What is the animal name? Save
- Use symmetric ciphers to encrypt message "“promise" and decrypt message "FOG". The representation of characters in modulo 26 is described as follows: Plaintext - a bcdefg|hijk1 mnopar stuvwx y z Ciphertext A BCD|EFG|HIJKL|M|NO|P|Q|R s T|U|VwxY|Z Value 00 01 02|03 04 05 06|07|08|09|10|11 12|13|14|15 16|17 18|19 20 21 22 23 24 25 The mathematical equations for encryption and decryption can be described as follows: Encryption Ea:i→i+kmod 26 Decryption Da : i→i-k mod 26 i represents the messages (plaintext or cipher), k represents a symmetric key. In this case k=20Use the RSA cipher with public key n = 713 = 23 · 31 and e = 43. Encode the word "HERO" into its numeric equivalent and encrypt it. (Encode one letter at a time. Assume the letters of the alphabet are encoded as follows: A = 001, B = 002, C = 003, ..., Z = 026.1. Encrypt the message “Take your bag with clothes” using the Hill cipher with the key !3 23 5 <-it is matrixShow your calculations and the result. 2.This problem explores the use of a one-time pad version of the Vigenere cipher. In thisscheme, the key is a stream of random numbers between 0 and 26. For example, if the key is 189 3…, then the first letter of plaintext is encrypted with a shift of 18 letters, the second with ashift of 9 letters, the third with a shift of 3 letters, and so on.Encrypt the plaintext “cryptography” with the key stream10 22 5 4 1 0 2 9 18 16 16 0 3.Does the set of residue classes (mod3) form a group with respect to modular addition?4. Determine -11 mod 95. Determine gcd(65042, 40902)6.Using the extended Euclidean algorithm, find the multiplicative inverse of 1279 mod 9721 Please write the correct answer. Thank you!