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GuDViN [60]
3 years ago
13

Consider an improved version of the Vigen ere cipher, where instead of using multiple shift ciphers, multiple mono-alphabetic su

bstitution ciphers are used. That is, the key consists of t random permutations of the alphabet, and the plaintext characters in positions i, t + i, 2t + i, and so on are encrypted using the ith permutation. Show how to break this version of the cipher.
Computers and Technology
1 answer:
anzhelika [568]3 years ago
6 0

Answer:

Kasiski’s method for determining 't' works for Vigenère cipher as well. The only difference is therefore in the second stage of the attack. In the second stage, one needs to build a frequency table for each of the 't' keys, and carry out an attack like on the mono-alphabetic cipher. Given a long enough plaintext, this will work successfully.

Explanation:

Kasiski method is a method of attacking polyalphabetic substitution ciphers such as Vigenère cipher. It is also called Kasiski test or Kasiski examination.

The method involve finding the length of the keyword and then dividing the message into that many simple substitution cryptograms. Frequency analysis could then be used to solve the resulting simple substitution.

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UkoKoshka [18]

Answer:

public class Car {

   private String __year_model;

   private String __make;

   private int __speed;

   //Creating the constructor

   public Car(String __year_model, String __make, int __speed) {

       this.__year_model = __year_model;

       this.__make = __make;

       this.__speed = __speed;

   }

   //Creatining the set and get methods

   public String get__year_model() {

       return __year_model;

   }

   public void set__year_model(String __year_model) {

       this.__year_model = __year_model;

   }

   public String get__make() {

       return __make;

   }

   public void set__make(String __make) {

       this.__make = __make;

   }

   public int get__speed() {

       return __speed;

   }

   public void set__speed(int __speed) {

       this.__speed = __speed;

   }

}

Explanation:

As stated in the question, The class Car is created using Java programming language with the three attributes year_model, make and speed.

Constructors as well as set and get methods were also created for each of the fields.

6 0
3 years ago
What is an assembler?
Flauer [41]

an assembler is a program that converts code written in a high-level language to assembly language that the computer processor can execute.

4 0
3 years ago
Python's ____ mechanism allows the programmer to view an interface for an entire class or an individual method, at the shell pro
eduard

The question above has multiple choices as follows;

a. API

b. docstring

c. help

d. man

Well, I am stuck between B and C. I’ll however settle for (B) docstring.


Python docstrings provide an easier way to associate documentation with python classes, modules and functions. The interactive help function on the other is built in and is intended for interactive use. This function exists to view help interactively. With the help feature, you can quickly learn classes, modules, functions and many more.






8 0
3 years ago
Write a Python 3 program that prompts the user for 3 postive numbers (or zero) and then adds them together. If the user enters a
Citrus2011 [14]

Answer:

def prompt_number():

   while True:

       number = int(input("Enter a number: "))

       if number >= 0:

           break

       

   return number

   

def compute_sum(n1, n2, n3):

   total = n1 + n2 + n3

   return total

   

n1 = prompt_number()

n2 = prompt_number()

n3 = prompt_number()

result = compute_sum(n1, n2, n3)

print(result)

Explanation:

Create a function named prompt_number that asks the user to enter a number until a positive number or 0 is entered and returns the number

Create a function named compute_sum that takes three numbers, sums them and returns the sum

Ask the user to enter three numbers, call the prompt_number() three times and assign the values

Calculate the the sum, call the compute_sum and pass the numbers as parameters

Print the result

6 0
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The case states that google intended the limited initial rollout to be a beta test of google glass, meaning that the adopters we
tigry1 [53]

Google intended the limited initial rollout to be a test of google glass, that the adopters were Innovators. The initial rollout of Google Glass was limited, purposefully so as to set the price very high. This mean that only a selected few, and those with plenty of disposable income, would be the first to use these devices. Google required people to register for the chance to receive a set. Even if many would want to spend the money on these devices, Google allowed only a selected few to receive them.

7 0
3 years ago
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