Assignment 2 Problem Submission Rules: 1) Detection of plagiarism will result in Failing grade....

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Assignment 2

Problem Submission Rules:
1) Detection of plagiarism will result in Failing grade. Students must do this
assignment by themselves.
2) After completion, your work must be submitted to an assignment folder in D2L
y a co
esponding deadline.
3) Late assignments will be accepted up to 24 hours after the due date for 50%
credit. Assignments submitted more than 24 hours late will not be accepted for
credit.
4) It is much better to submit a partial/failed-attempt solution than none. Include
the circumstances of the incompletion in your report.
Problems:
The aim of this assignment is to implement a Feistel cipher round function which consists of
the following steps:
1. Implementing a Feistel Cipher – 70 points
Step 1: The function takes as input 8 bits and the 4-bit key ??.
Step 2: The binary is divided into two halves (??0 and ??0).
Step 3: The function computes ??1 = ??0 and ??1 = ??0 ⊕??(??0,??), where
??(??0,??) = 2 × ??0?? ?????? 24
Step 4: The function performs a swapping of ??1 and ??1, then outputs ??1||??1.
2. Combining with Assignment 1 – 20 points
Improve your implementation for 1 by using your Text Converter, so it can handle a
string from a user and output a string.
3. Make some test codes to show the co
ectness of your implementation – 10 points
Note: It is recommended to exchange a ciphertext generated by the implementation with your
friend and check the decryption algorithm successfully recovers the original plaintext (you can
use the discussion section in D2L).
Complier requirement:
The text converter must be implemented using Python version 3.9.x or higher. Students
must use Python official li
aries that are accessible from the webpage
(https:
docs.python.org/3/li
ary/index.html). All used li
aries and their purpose should be
described in the report.
Submission instructions:
Please submit your deliverables to the D2L Assignments folder:
(a) “2. Feistel Cipher”: create a txt file, copy and paste your entire Python code, save,
and then submit with a written report explaining your implementation. The report
should have some test inputs and screenshots of execution results, which verify the
co
ectness of your implementation.
Once you submit, D2L will perform a similarity check for your submission and show you the
esult. Your similarity score must be lower than 50% unless valid reasons for a high score
described in the report. Otherwise, (the score -50%) will be deducted.
https:
docs.python.org/3/li
ary/index.html

2-feistel-cipher-meu4swbu.pdf

Neha · Accepted Answer

77838 - feistal cipher/__pycache__/code.cpython-39.pyc
77838 - feistal cipher/code.py
import binascii
import random
  
# Defining BinarytoDecimal() function  
def BinaryToDecimal(binary):  
    string = int(binary, 2)        
    return string
# Function to implement bit exor 
def exor(value1,value2):       
    temp = ""        
    for i in range(length):           
        if (value1[i] == value2[i]): 
            temp += "0"              
        else:  
            temp += "1"              
    return temp
# Random bits key generation 
def rand_key(value):    
    key1 = "" 
    value = int(value)       
    for i in range(value):           
        temp = random.randint(0,1) 
        temp = str(temp) 
        key1 = key1 + temp
    return(key1)
plainText = input("Please enter plain text: ")
print("Plain Text is:", plainText)
plainText_Ascii = [ord(x) for x in plainText]
plainText_Binary = [format(y,'08b') for y in plainText_Ascii] 
plainText_Binary = "".join(plainText_Binary)
length = int(len(plainText_Binary)//2) 
Left1 = plainText_Binary[0:length] 
Right1 = plainText_Binary[length::] 
m = len(Right1)
# Generate Key K1 for the  
# first round 
Key1= rand_key(m)
# Generate Key K2 for the 
# second round 
Key2= rand_key(m)
# first round of Feistel 
form1 = exor(Right1,Key1) 
Right2 = exor(form1,Left1) 
Left2 = Right1
# Second round of Feistel 
form2 = exor(Right2,Key2) 
Right3 = exor(form2,Left2) 
Left3 = Right2
# Cipher text 
bin_data = Left3 + Right3 
string_data =' '
  
for i in range(0, len(bin_data), 7):
    temp_data = bin_data[i:

Assignment 2 Problem Submission Rules: 1) Detection of plagiarism will result in Failing grade. Students must do this assignment by themselves. 2) After completion, your work must be submitted to an...

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