Byte InsightKrakin Kodes
Produce a program which will read unencrypted ‘plaintext’ text from a file and encode it with a numerical shift between 1 and 26 e.g 2. It should write the encoded ‘ciphertext’ to a new file.
More information can be found on the shift cipher at Wikipedia.
Variable and Validation Table
| Variable Name | Data Type | What it does? | Origin | Validation Req. |
|---|---|---|---|---|
| shift | Integer | Used to move each letter along the alphabet e.g. 2 would mean a = c. | User Input | Must be a positive integer between 0 and 26 |
| message | String | This is the text that the user wants encrypted. | User Input | Must be an alpha numeric string of length greater than 0. |
| ciphertext | String | Stores the encoded message | Process | N/A |
Extensions
- Write a decryption function for the Shift Cipher.
- Write a Function called Atbash which encodes the file using AtBash e.g. A ?Z, B ?Y, C ?X etc.
- Write a code breaking function for the Shift Cipher.