My Little Enigma

Simple encryption program, that uses four gears to switch letters.

Functions

• encode a message and save it into a file
• decode a message and show the results
• decode a message and save it into a file
• it does not however encode files.

Usage

1. E - creates a new encoded file:

• the first prompt asks for the new file's name
  • in case it's already taken, the program asks if continue anyway
  • the old file will be overwritten if proceed (by typing t)
• then it asks to set four coding gears
  • each has a different size indicated by the number in brackets
  • user is supposed to give a number from 0 to n
  • however, it works even with greater numbers, by taking a mod from them
• after that, the program asks if the setting is correct
  • in case of any mistakes, (t for yes, n for no)
• the next prompt is a field to write a message to encode
  • it's 500 signs max, but after each Enter the limit resets
  • it's an infinite loop, to break it "ZAK" needs to be typed
  • it only works however at the beginning of the input
• finally, the program puts encoded message in a file and ends

2. W - reads an already existing encrypted file:

• the first prompt asks for the encrypted file's name
  • if the file doesn't exist, the program will quit
• then it asks to set four coding gears
  • each has a different size indicated by the number in brackets
  • user is supposed to give a number from 0 to n
  • however, it works even with greater numbers, by taking a mod from them
• after that, the program asks if the setting is correct
  • in case of any mistakes, (t for yes, n for no)
• then the program asks if save the results or just show them on a screen
  • the results can be saved later regardless
  • it cannot be however showed after choosing to save
  • s is for save, and d for a just show (and maybe save later)
• if a showing is chosen, the decoded message should be seen on a screen
• then the program asks again if save the showed results
  • t for yes, n for no, and if yes the new file's name needs to be provided
  • and if the name is already taken, the program will warn about it
  • WARNING: do not use the same name as the encrypted file or it'll make it blank!

3. Q - terminates the program, instantly.

Examples

In the folder exe, beside an executable file, there are examples of encoded messages.

• to decode them gears need to be set according to corresponding files' names.