1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Elena-2011 [213]
3 years ago
7

Encryption has a remarkably long and varied history. Spies have been using it to convey secret messages ever since there were se

cret messages to convey. One powerful method of encryption uses random digits. Two documents are prepared with the same random sequence of numbers. The spy is sent out with one and the spy master retains the other. The digits are used as follows. Suppose that the word to be encrypted is SPY and the random digits are 352. Then S becomes V (three letters after S), P becomes U (five letters after P), and Y becomes A (two letters after Y, restarting at A after Z). The spy would encrypt a message and then destroy the document used to encrypt it. This is an early example of
Computers and Technology
1 answer:
Serga [27]3 years ago
3 0

One-time pad. The one-time pad (OTP) is an encryption technique that cannot be cracked, but requires the use of a one-time pre-shared key the same size as, or longer than, the message being sent. In this technique, a plaintext is paired with a random secret key (also referred to as a one-time pad). Then, each bit or character of the plaintext is encrypted by combining it with the corresponding bit or character from the pad using modular addition. If the key is truly random, at least as long as the plaintext, never reused in whole or in part, and kept completely secret, then the resulting ciphertext will be impossible to decrypt or break. It has also been proven that any cipher with the perfect secrecy property must use keys with effectively the same requirements as OTP keys. Digital versions of one-time pad ciphers have been used by nations for some critical diplomatic and military communication, but the problems of secure key distribution have made them impractical for most applications.

You might be interested in
What method of research deals with large amounts of information that is analyzed and presented statistically?
Alenkinab [10]
Method of research deals with large amounts of information that is analyzed and presented statistically is quantitate.
6 0
3 years ago
The two roots of a quadratic equation ax^2 + bx + c = 0 can be obtained using the following formula:
Feliz [49]

Answer: ion k

Explanation:

4 0
3 years ago
WHAT DO I DO IN MY FREE TIME????
yanalaym [24]

Answer:

what do u mean

Explanation:

7 0
3 years ago
Read 2 more answers
There are well-known classes of problems that are intractably difficult for computers, and other classes that are provably undec
Wittaler [7]
No. It is not impossible to understand and make this algorithm a success. It may only take a longer duration to reach success but it does not that it is impossible. Problems may become more difficult to understand and debug but there is enough time, duration, resources and support, the algorithm can be developed.
4 0
3 years ago
Write a program that reads a list of integers, and outputs those integers in reverse. The input begins with an integer indicatin
lyudmila [28]

Answer:

Following is the program in C language :

#include <stdio.h> // header file

#define n 5 //  macro

int main() main function

{

   int a[n],k1; // variable and array declaration

   printf("Enter the element:\n");

   for(k1=0;k1<n;++k1) //iterating the loop

   {

       scanf("%d",&a[k1]);//Read the values by user

   }

   printf("Output in Reverse Order:\n");

   for(k1=n-1;k1>=0;--k1)//iterating the loop

   {

   printf(" %d ",a[k1]); //Display the values

   }

   return 0;

}

Output:

Enter the element:

4

3

45

67

89

Output in Reverse Order: 89 67 45 3 4

Explanation:

Following is the description of the program

  • Define a macro "n" with value 5 after the header file.
  • Declared an array "a" and defined the size of that array by macro i.e "n".
  • Read the value by the user by using scanf statement in the array "a"
  • Finally In the last for loop display the values of array "a" by space.

7 0
3 years ago
Other questions:
  • 19. Which network topology is a combination of two or more types of physical or two or more types of logical topologies? A. Poin
    8·1 answer
  • which one of these steps describe saving a newly created file. click on the save icon. minimize the file. name the file. select
    12·2 answers
  • how can you repin an image on your Pinterest pin board A. click on the "repin" button B. click on the "add pin" button C. click
    7·2 answers
  • In Microsoft Excel, which formula will yield a value of 10? 5x2 5x2*.5+5 =5*1.5 =(100/5*2)*.25
    13·2 answers
  • When an Item is base lined, it becomes frozen, here frozenmeans that only creating an old version can change the item
    9·1 answer
  • What is the difference between a switch and a hub?
    8·1 answer
  • To make slides in a PowerPoint Online application presentation have the same transition effect, select __________ on the Transit
    11·2 answers
  • ______ view is generally used for creating, formatting and designing slide​
    13·1 answer
  • Give short answers.
    14·1 answer
  • प्रश्न-20 उचित स्थान पर विराम चिह्न लगाइए
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!