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GuDViN [60]
2 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]2 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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2 years ago
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Company A is setting up a network of mostly Windows machines. Which networking file system protocol would you recommend for maxi
maxonik [38]

Answer:

For maximum interoperability, NFSv4 is recommended.

Explanation:

When setting up a network of mostly windows machines, it is better to use NFSv4 because it includes performance improvements, mandates strong security, and a stateful protocol.

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2 years ago
When a button is selected, the computer processes the code contained in the buttons ____ event procedure?
My name is Ann [436]
The event is called keypress, usually the code is referred to as callback.
6 0
2 years ago
A Consider the following method definition. The method printAllCharacters is intended to print out every character in str, start
ozzi

Answer:

<em>(c) The method call, which worked correctly before the change, will now cause a run-time error because it attempts to access a character at index 7 in a string whose last element is at index 6.</em>

<em />

Explanation:

Given

printAllCharacters method and printAllCharacters("ABCDEFG");

Required

What happens when  x < str.length() is changed to x <= str.length()

First, we need to understand that str.length()  gets the length of string "ABCDEFG"

There are 7 characters in "ABCDEFG".

So: str.length()  = 7

The first character is at index 0 and the last is at index 6

Next, we need to simplify the loop:

for (int x = 0; x< str.length(); x++) means for (int x = 0; x< 7; x++)

The above loop will iterate from the character at the 0 index to the character at the 6th index

while

for (int x = 0; x<=str.length(); x++) means for (int x = 0; x<=7; x++)

The above loop will iterate from the character at the 0 index to the character at the 7th index

Because there is no character at the 7th index, the loop will return an error

Hence: (c) is correct

7 0
2 years ago
Given positive integer numInsects, write a while loop that prints that number doubled without reaching 200. Follow each number w
Gre4nikov [31]

Answer:

numInsects = 16

while numInsects < 200:

   print(str(numInsects) + " ", end="")

   numInsects *= 2

Explanation:

*The code is in Python.

Set the numInsects as 16

Create a while loop that iterates while numInsects is smaller than 200. Inside the loop, print the value of numInsects followed by a space. Then, multiply the numInsects by 2.

3 0
2 years ago
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