Caesar Cipher
This is code that I modified from a couple of examples in a book to make it more useful.
It takes STDIN as input. Except for the bruteforce method, it also allows for case-sensitivity.
In the case of bruteforce, you can usually see the shift used, then pipe the original message in with echo [message] | ./caesar.py [shift] -d in order to re-obtain the original case-sensitivity.
Usage:
./caesar.py <[# OF SHIFTS] [-e|-d]> | <[--brute]>
Examples
echo 'stuff to encrypt' | ./caesar.py 11 -e
echo 'DEFQQ EZ PYNCJAE' | ./caesar.py 11 -d
cat decrypted_file.txt | ./caesar.py 3 -e
./caesar.py 3 -d < encrypted_file.txt
echo 'DEFQQ EZ PYNCJAE' | ./caesar.py --brute