Cipher.py is a standalone Python creation of the Vigenère cipher. It can be downloaded and run in a Python 3 console.
A message is encrypted by using a keyword.
Each letter within the message is shifted by the corresponding letter of the keyword to create the ciphertext.
The ciphertext is decrypted by using the keyword to reverse the Caesar ciphers of the message.
It is required that you have Python installed. Then you can download and run cipher.py on your own system.
Encryption or Decryption?
Type either 'Encryption' or 'Decryption'. Captitalization does not matter.
'e', 'n', 'en' and 'encrypt' or 'd', 'de' and 'decrypt' are also accepted respectively.
Enter secret your message...
Type out the message you want to be encrypted.
This cipher is alphabetic only. Capitalization will be converted to lowercase.
Punctuation, numbers, special characters and spaces will all be removed!
Enter the cipher key...
Enter a key for the encryption. The key must be at least as long as the original message.
Make sure to share this key with the recipient or store it for decryption!
Remember, This cipher is alphabetic only.
It is best if the key is as random as possible with little repetition.
Dictionary words are known to cause weaknesses in this encryption method.
Press Enter to encrypt
Any key will do really.
Enter your encrypted message...
Enter the encrypted message.
Capitalization does not matter.
Enter the cipher key...
Enter the key used to encrypt the original message.
Press Enter to encrypt
Let's hope everything goes well!
The output of the encryption or decryption will be displayed.
Try different encryption keys to see the difference in the encryption!
I hope you enjoy! I had a great time building this cipher and hope you like it.
Hopefully I can publish it as a webapp in the near future.
The cipher is now available online!
The encryption method can certainly be improved upon but I wanted to stay true to the original design.
This project is based on an article in Popular Science: The Secrets of Codes. The representation of a Vigenére cipher in the article uses 1 as the value for A. I used this as a guide for my project and thus 'a' + 'a' = 'b' (or 1 + 1 = 2). Although most tabula rectas represent A as 0, representing A as 1 ensures that all characters are shifted.