CaesarCode

A kinda simple gem that implements and breaks Caesar or Shift (basically Caesar cipher with a number of shifts not equivalent to 3) ciphers. Breaking a cipher relies on user input to confirm a message is readable and makes sense. The 15 most common words of the English language are loaded by default and the user is prompted a message asking whether or not the cipher was successfully broken based on this list of words; the list can be arbitrarily extended as an optional second parameter to the #decipher method.

Add this line to your application's Gemfile:

gem 'caesar_code'

And then execute:

$ bundle

Or install it yourself as:

$ gem install caesar

Enciphering:

CaesarCode.encipher("abcd")
# => "DEFG"
# By default, the encryption shifts each letter 3 times.
CaesarCode.encipher("IBM",25)
# => "HAL"
# The encryption can also be made with an arbitrary number of shifts.

Deciphering:

CaesarCode.decipher("cf")
# Will prompt the user asking if the message "BE" makes any sense (as "BE" is one of the most common words in English)
CaesarCode.decipher("ifmmp IBM", "HAL")
# Will prompt the user on the message "HELLO HAL", as "HAL" was added to the list of words to search for in the text.

1. Fork it ( https://github.com/[my-github-username]/caesar/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request