We have studied some interesting algorithms to perform Encryption and Decryption. In this context you are required to implement and test two algorithms namely:

1. Caesar Cipher
2. Vigenre Cipher

Requirements

You are required to implement the following functionality:

1. Plain Text to Cipher Text (Encryption):
   1. Get a user input from the screen or from a file as plain text.
   2. Get a key from the user or from a file.
   3. Encrypt the plain text from 1 using the key from 2 and either save the resultant cipher text on a file or display it on the screen.
2. Cipher Text to Plain Text (Decryption):
   1. Get a user input from the screen or from a file as cipher text.
   2. Get a key from the user or from a file.
   3. Decrypt the cipher text from 1 using the key from 2 and either save the resultant plain text on a file or display it on the screen.