I am looking for help with this password saver problem. Most of the code is prov

Question

I am looking for help with this password saver problem. Most of the code is provided..

Here is the question

We will be extending the Caesar cypher we looked at earlier into a full-fledged password saver. The program will be able to:

Lookup passwords for websites

Add new passwords for websites (encrypting them with the caesar cypher)

Store these passwords to a file on the computer

Load passwords from a stored password file

Most of the code is provided but there are some critical components missing. You will need to add these components.

Explanation / Answer

Code

Password Saver.py
import csv
import sys

#The password list - We start with it populated for testing purposes
passwords = [["yahoo","XqffoZeo"],["google","CoIushujSetu"]]


#The password file name to store the passwords to
passwordFileName = "samplePasswordFile"

#The encryption key for the caesar cypher
encryptionKey=16

#Caesar Cypher Encryption
def passwordEncrypt (unencryptedMessage, key):

#We will start with an empty string as our encryptedMessage
encryptedMessage = ''

#For each symbol in the unencryptedMessage we will add an encrypted symbol into the encryptedMessage
for symbol in unencryptedMessage:
if symbol.isalpha():
num = ord(symbol)
num += key

if symbol.isupper():
if num > ord('Z'):
num -= 26
elif num < ord('A'):
num += 26
elif symbol.islower():
if num > ord('z'):
num -= 26
elif num < ord('a'):
num += 26

encryptedMessage += chr(num)
else:
encryptedMessage += symbol

return encryptedMessage

def loadPasswordFile(fileName):

with open(fileName, newline='') as csvfile:
passwordreader = csv.reader(csvfile)
passwordList = list(passwordreader)

return passwordList

def savePasswordFile(passwordList, fileName):

with open(fileName, 'w+', newline='') as csvfile:
passwordwriter = csv.writer(csvfile)
passwordwriter.writerows(passwordList)

while True:
print("What would you like to do:")
print(" 1. Open password file")
print(" 2. Lookup a password")
print(" 3. Add a password")
print(" 4. Save password file")
print(" 5. Print the encrypted password list (for testing)")
print(" 6. Quit program")
print("Please enter a number (1-4)")
choice = input()

if(choice == '1'): #Load the password list from a file
passwords = loadPasswordFile(passwordFileName)

if(choice == '2'): #Lookup at password
print("Which website do you want to lookup the password for?")
for keyvalue in passwords:
print(keyvalue[0])
passwordToLookup = input()

####### YOUR CODE HERE ######
#You will need to find the password that matches the website
#You will then need to decrypt the password
#
#1. Create a loop that goes through each item in the password list
# You can consult the reading on lists in Week 5 for ways to loop through a list
#
for i in range (len(passwords)): #Create a loop that goes through each item in the password list
i = [0, 1]

#2. Check if the name is found. To index a list of lists you use 2 square backet sets
# So passwords[0][1] would mean for the first item in the list get it's 2nd item (remember, lists start at 0)
# So this would be 'XqffoZeo' in the password list given what is predefined at the top of the page.
# If you created a loop using the syntax described in step 1, then i is your 'iterator' in the list so you
# will want to use i in your first set of brackets.
#
#3. If the name is found then decrypt it. Decrypting is that exact reverse operation from encrypting. Take a look at the
# caesar cypher lecture as a reference. You do not need to write your own decryption function, you can reuse passwordEncrypt
#
# Write the above one step at a time. By this I mean, write step 1... but in your loop print out every item in the list
# for testing purposes. Then write step 2, and print out the password but not decrypted. Then write step 3. This way
# you can test easily along the way.
#


####### YOUR CODE HERE ######


if(choice == '3'):
print("What website is this password for?")
website = input()
print("What is the password?")
unencryptedPassword = input()

####### YOUR CODE HERE ######
#You will need to encrypt the password and store it in the list of passwords

#The encryption function is already written for you
#Step 1: You can say encryptedPassword = passwordEncrypt(unencryptedPassword,encryptionKey)]
#the encryptionKey variable is defined already as 16, don't change this
#Step 2: create a list of size 2, first item the website name and the second item the password.
#Step 3: append the list from Step 2 to the password list

encryptedpassword = passwordEncrypt(unencryptedPassword, encryptionKey)
newPassword = [[website, encryptedpassword]]
passwords.append(newPassword)

####### YOUR CODE HERE ######

if(choice == '4'): #Save the passwords to a file
savePasswordFile(passwords,passwordFileName)


if(choice == '5'): #print out the password list
for keyvalue in passwords:
print(', '.join(keyvalue))

if(choice == '6'): #quit our program
sys.exit()

print()
print()

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.