[RC4J"RC4 is a stream cipher standard that was used widely on the Internet. Read the below pseudocode for its initialization phase and cipher bitstream generation phase:// Initializationbyte key [N];// input key of the algorithm (E.g., N = 16)byte K[256] ;// keying materialbyte s[256];// internal statesfor i = 0 to 255s[i] = iK[i] = key[i (mod N) ]j = 0for i = 0 to 255j = () + S[i] + K[i]) mod 256swap (S[1], s[j])i = j = 0// cipher Bitstream Generationi = (i + 1) mod 256j = () + S[i]) mod 256swap (S[i], s[j])t = (S[i] + S[j]) mod 256cipherstream = s[t]How many bits will be used for encryption finally? Explain the relation of the arrays key and S, which leads to the selection of these bits.

[RC4) RC4 is a stream cipher standard that was used widely on the Internet. Read the below pseudocode for its initialization phase and cipher bitstream generation phase: // Initialization byte key [N]; // input key of the algorithm (E.g., N = 16) byte K[256]; // keying material byte s[256]; // internal states for i = 0 to 255 S(1] = i K[i] = key(1 (mod N) 1 for i = 0 to 255 j = () + S[i] + K[i]) mod 256 swap (S[1], s[j]) i = j = 0 // Cipher Bitstream Generation i = (i + 1) mod 256 j = () + s[i]) mod 256 swap (S[i], s[j]) t = (S[i] + S[j]) mod 256 cipherstream = s[t] How many bits will be used for encryption finally? Explain the relation of the arrays key and S, which leads to the selection of these bits.

[RC4) RC4 is a stream cipher standard that was used widely on the Internet. Read the below pseudocode for its initialization phase and cipher bitstream generation phase: // Initialization byte key [N]; // input key of the algorithm (E.g., N = 16) byte K[256]; // keying material byte s[256]; // internal states for i = 0 to 255 S(1] = i K[i] = key(1 (mod N) 1 for i = 0 to 255 j = () + S[i] + K[i]) mod 256 swap (S[1], s[j]) i = j = 0 // Cipher Bitstream Generation i = (i + 1) mod 256 j = () + s[i]) mod 256 swap (S[i], s[j]) t = (S[i] + S[j]) mod 256 cipherstream = s[t] How many bits will be used for encryption finally? Explain the relation of the arrays key and S, which leads to the selection of these bits.

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter8: Data And Network Communication Technology

Section: Chapter Questions

Problem 41VE

See similar textbooks

Similar questions

Part 2: Encryption Objective: Develop a program that encrypts a plaintext file by XORing 128-bit blocks of the file with a key repeatedly until the entire file is encrypted. Details: • The plaintext file will be a book from Project Gutenberg. • The encryption method should use the XOR operation on the file, 128 bits at a time, with the key. • Each 128-bit block is XORed with the same key. • The program should work from the command line and accept three parameters: o The name of the key file o The name of the plaintext file o The desired name of the resulting ciphertext file Note: This encryption method is not supposed to be secure. Usage: $ ./bad_streamcipher_enc kf pt ct
implementation of Caesar Cipher Using Python Write Code: You are required to implement the Caesar Cipher encryption/decryption algorithm in Python. Remember to implement the algorithm in such a way that it takes a file as input, encrypts it and store in the current directory. This encrypted file must checkable. The implementation must have a decryption procedure which takes the encrypted file from the current directory, decrypts it and store it with some specific name in the current directory. The name should be different from the original file so that it can be verified.
Step 1 Intro Cipher block chaining mode in DES (Date Encryption Standard): It is a type of cipher mode where all the cipher blocks are chained to avoid the replacement of blocks. In this model, all the blocks are chained before encryption; the plaintext in a block is XOR (Exclusive OR) with a cipher text of the previous bloc. Here, the key advantage is that the output present in the cipher text block is not the same as the plaintext block. arrow_forward Step 2 Solution: Cipher feedback mode in DES (Data Encryption Standard): This type of mode is used to encrypt the data by byte-to-byte. It is similar to the cipher block chaining mode, if the encryption process in cipher block chaining is reversed, it is the decryption process of Cipher feedback mode. During the encryption process, one byte is encrypted first and sent out. Then the encryption process is carried out with the next byte. Conclusion: The output stream generated by the encryption process in cipher…
A [answer] cipher is typically implemented by performing a AND mathematical operation at least two bytes at a time. A. stream B. DES C. key D. block
If header files are added please provide them The Caesar cipher is one of the earliest known and simplest ciphers. It is a type of substitution cipher in which each letter in the plaintext is 'shifted' a certain number of places down the alphabet. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z U V W X Y Z A B C D E F G H I J K L M N O P Q R S T H E L L O W O R L D Normal Text B Y F F I Q I R M X Encrypted Text You are tasked to create an encryption program which takes a key word. The keyword will fill the first part of the shifted array. The remaining letters will fill the end of the array. It should look like this: Key=”TOY A B C D E F G H I J K L M N O P Q R S T U V W X Y Z T O Y A B C D E F G H I J K L M N P Q R S U V W X Z You should have an interactive menu with the following options: 1 Enter Key word //takes new key word and…
6. In a Rivest, Shamir and Adleman (RSA) cryptosystem, a particular user uses two prime numbers P and Q to generate the public key and the private key. If P is 23 and Q is 29, using RSA algorithm, find the following: e) public key f) private key g) Encrypted data (Assume the original message, M=7) h) Decrypted data
Using C++ Comments are very helpful If header files are added please provide them The Caesar cipher is one of the earliest known and simplest ciphers. It is a type of substitution cipher in which each letter in the plaintext is 'shifted' a certain number of places down the alphabet. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z U V W X Y Z A B C D E F G H I J K L M N O P Q R S T H E L L O W O R L D Normal Text B Y F F I Q I R M X Encrypted Text You are tasked to create an encryption program which takes a key word. The keyword will fill the first part of the shifted array. The remaining letters will fill the end of the array. It should look like this: Key=”TOY A B C D E F G H I J K L M N O P Q R S T U V W X Y Z T O Y A B C D E F G H I J K L M N P Q R S U V W X Z You should have an interactive menu with the following options: 1…
Experimenting with AES-”S symmetric key cipher. Note: You may use any programming language that provided libraries for AES. Descrion: This assignment consists of two parts:PART 1: write a program that uses AES-12/1 to decrypt a message. The program should be named "decrypt", and should deal with three files that contain the encrypted text as a stream of bytes, the 128-bit key for decryption stored as a stream of bytes, and file outcome of the decryption, respectively. o To test this program, here's an example of an encrypted message a. its 128-bit secret key PART 2: you will try to use "brute force" to decrypt an encrypted message, where you only have Sirrst 96-bits of the 12S-bit secret key (last 9 bytes of the secret key are he 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, respetively. The program should decryptedn standard the the missing h6177 of the key in hexadecimal,…
The ROT-13 algorithm encrypts a string one character at a time by adding 13 to the value of the internal representation of the character. We want our encryption scheme to cover the entire printable ASCII range. After examining the ASCII character set and their internal representations, we see that characters 0 through 32 and character 127 are control characters. Technically, characters 32 (space) and 127 (DEL) are printable, but we don’t want to include them in our encryption routine. Therefore, we want our encrypted string to only contain characters in the range of 33 through 126. As an example: Plaintext: Norwich Ciphertext: [|!&vpu The internal representation of ‘N’ is 78. 78 plus 13 is 91, which is the character ‘[‘. The internal representation of ‘o’ is 111. 111 plus 13 is 124, which is the character ‘|’. The internal representation of ‘r’ is 114. 114 plus 13 is 127. Since 126 is our maximum value for our desired printable range, we…
PART 1 1. Using python, create a program with a function of enc_text(text, key) to encrypt the variable text using the provided key (executing a modified version of Ceasar Cipher). Follow these rules: а. The key will contain a word made up of the letters 'a' and 'b'. The cipher will use the key to know the direction of the shift: • 'a' - the character must be shifted upwards • 'b' - the character is to be shifted downward. b. The number of characters in the key will determine the number of positions to shift. c. The given text variable will only have characters from the ASCII table (values between 32 and 126). d. If the key is invalid (contains characters other than a and b or an empty string) or the text is invalid (empty string), no encryption will happen and the function returns the original text. e. The key will loop through again to accommodate the additional text characters if the text has more characters than the key. Brute force solutions will not be accepted and an iterative…
One method that can be used to compress text data is run length encoding (RLE). When RLE is used the compressed data can be represented as a set of character/frequency pairs. When the same character appears in consecutive locations in the original text it is replaced in the compressed text by a single instance of the character followed by a number indicating the number of consecutive instances of that character. Single instances of a character are represented by the character followed by the number 1. Figure 9 and Figure 10 show examples of how text would be compressed using this method. Figure 9 Original text: AAARRRRGGGHH Compressed text: A 3 R 4 G 3 H 2 Figure 10 Original text: CUTLASSES Compressed text: C 1 U 1 T 1 L 1 A 1 S 2 E 1 S 1 What you need to do Task 1 Write a Python program that will perform the compression process described above. The program should display a suitable prompt asking the user to input the text to compress and then output the compressed text. Task 2 Test…
9. Cryptology is the science of making and breaking codes. This lab explores how the idea or functions and their inverses can be used to encode and decode messages. To encode and decode a message, first replace each letter of the alphabet with a positive integer using the following scheme, thus rewriting the original message as numbers instead of words: P- 16 Q- 17 R- 18 S- 19 T-20 Z-26 Blank - 27 A – 1 В - 2 С -3 D- 4 E- 5 F- 6 G- 7 H-8 |- 9 J- 10 K- 11 L-12 М -13 N- 14 O- 15 U- 21 V- 22 W-23 X-24 Y-25 ENCODING: A one-to-one function can be used to encode a numerical message. For example, suppose you want to send the message MATH to a friend, and you have decided that the function f(x) = 3x + 4 will be the encoding function, This function simply describes the procedure used to create the encoded message – in this case multiply by 3 and add 4. First change the letters to corresponding numbers as shown above: 13 1 20 8. Then use these as the input values in f(x). Tuoy Jud noltonut…