Vigenere Cipher Key Generator Python
- Feb 14, 2018 vigenere-cipher. A python code that performs a Vigenere cipher. Do both encryption of a plain text or decryption for a cipher text. In Vigenere cipher the key used in encryption or decryption is a single word and the message contains characters only.
- Encoder/decoder - vigenere cypher: text to encode- key =.
- About the Vigenere cipher: The key used by the Vigenere cipher is a string. And more importantly, it must be a substring extracted from the plain text. Suppose the key is “Bob”, since the length of “Bob” is less than the plain text, you will need to pad the key to the same length of the plain text before the encryption.
- Jul 29, 2017 I am trying to code in python using a caesar and a vigenere cipher so the user can pick which one they want to use and encrypt or decrypt. I have coded the caesar but really struggling with the vigenere can anyone please help as im lost with this.
- Vigenere Cipher Key Generator Python Download
- Vigenere Cipher Key Generator Python List
- Yahoo Towers Cipher Key
Nov 28, 2016 Very easy tutorial on how to code a simple Vigenere Cipher in python. How to generate random keys: A good exercise for programmi.
Vigenere Cipher Key Generator Python Download
| 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 I wrote one that handles all default ASCII characters (95): For example: |
commented Jan 3, 2018 • edited
edited
Vigenere Cipher Key Generator Python List
commented Mar 6, 2018
@flipperbw , |
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! |
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. |
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 |