Vigenere Cipher Key Generator Python

15.12.2020 admin

Vigenere Cipher Key Generator Python Rating: 3,6/5 9556 reviews

Yahoo Towers Cipher Key
Vigenere Cipher Key Generator Python Tutorial

vigenere.py

Encryption with Vigenere uses a key made of letters (and an alphabet). There are several ways to achieve the ciphering manually: Vigenere Ciphering by adding letters. In order to cipher a text, take the first letter of the message and the first letter of the key, add their value (letters have a value depending on their rank in the alphabet, starting with 0). Keep all your production businesses up to date by automating the entire patching process using Patch Manager Plus. Available as both cloud-based and on-premise software, Patch Manager Plus offers features that include scanning for and detecting missing patches, automated scheduled patch.

defencrypt(plaintext, key):

key_length=len(key)

key_as_int= [ord(i) foriinkey]

plaintext_int= [ord(i) foriinplaintext]

ciphertext='

foriinrange(len(plaintext_int)):

value= (plaintext_int[i] +key_as_int[i%key_length]) %26

ciphertext+=chr(value+65)

returnciphertext

defdecrypt(ciphertext, key):

key_length=len(key)

key_as_int= [ord(i) foriinkey]

ciphertext_int= [ord(i) foriinciphertext]

plaintext='

foriinrange(len(ciphertext_int)):

value= (ciphertext_int[i] -key_as_int[i%key_length]) %26

plaintext+=chr(value+65)

returnplaintext

commented Jan 3, 2018

I think there are limitations here with lower case and capital letters. You'd need to check for .lower()What is the key quest for monster hunter generations. , and also simply pass the character through if it doesn't match A-Z.

I wrote one that handles all default ASCII characters (95): /using-ip-domain-name-and-generate-rsa-key.html.

For example:

commented Jan 3, 2018•
edited

commented Mar 6, 2018

@flipperbw ,
I'm trying to make a similar program. Would you mind reposting your code with comments; I'm having a bit of a hard time following it.
Thanks.

commented May 1, 2018

I implemented this some years ago, along with a tabula recta generator so you can do it by hand (for fun!)

commented Jan 10, 2020

Hello!
in your first code (the one that starts like:
def vig(txt=', key=', typ='d'):
if not txt:
print 'Needs text')
there is a thing called 'ret_text'
what does it do? I am trying to get inputs and then encode/decode it but I am not sure how I should do that, if only I knew what ret_text does. Can you specify it?
Thanks!

commented Jan 10, 2020

It's just the return text, that one by one figures out the proper character to return given the key. It's been a while since I wrote this snippet but if it can find a match of an ascii character, itll convert that, else it will leave it alone.

vigenere cipher

Yahoo Towers Cipher Key

letters = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',' ','.',',','?','1','2','3','4','5','6','7','8','9','0']

cipher = []

pos_key = []

pos_text = []

pos_cipher = 0

key = []

plain = []

letters_len = 40

import os

def find_pos(value):

temp = []

i=0

while i<len(value):

j=0

while j<letters_len:

if value[i] letters[j]:

temp.append(j)

j = j+1

i= i+1

return temp

def chek_end(m,n,size):

if msize and n<size:

m=0

return m

if msize and nsize:

return m,n

return m

def vigenere_encrypt(n):

K = raw_input('Enter The Key ::::')

P= raw_input('Enter The String To encrypt or decrypt ::::')

key = map(lambda k:k.lower(),K)

plain = map(lambda p:p.lower(),P)

pos_key = find_pos(key)

pos_text = find_pos(plain)

if len(pos_key) > len(pos_text):

range_list = pos_key

else :

range_list = pos_text

i=0

j=0

loop_pass = 0

while i<len(range_list) and j<len(range_list) and loop_pass<len(pos_text):

try:

pos_cipher = n*pos_key[i] + pos_text[j]

if pos_cipher<letters_len:

cipher.append(letters[pos_cipher])

else:

pos_cipher = pos_cipher-letters_len

cipher.append(letters[pos_cipher])

i = i+1

j = j+1

if ilen(pos_key) and j<len(pos_text):

i=0

elif jlen(pos_text) and i<len(pos_key):

j=0

loop_pass = loop_pass + 1

except:

print('Oops Something went wrong')

result = ' .join(cipher)

print result

if __name__'__main__':

n = input (' 1 for encrypt n-1 for decryptn::::')

vigenere_encrypt(n)

end=input ('press <enter>')

pass