Introduction
------------
This script is designed to be used like a command to encrypt/decrypt files.
It uses RC-4 (128-bit) encryption technology, which is the same as what
most secure web sites use. Encrypted files have the .crypt suffix appended
to the file name.

Crypt is free and very powerful. It uses open source (OpenSSL) technology
and can be used to encrypt/decrypt as many files as you want in a single
command.


Installation
------------
Expand the archive on your desktop (presumably, if you're reading this
file, you've already done that) using Stuffit Expander. Then, as the root
user, copy crypt and shred to /usr/local/bin and make sure all users have
execute permissions. A set of installation commands for novices are:
	su
	<type your administrator password>
	cp -i - /Users/<your user name>/Desktop/Crypt/crypt /usr/local/bin

If you get a "No such file or directory" error after this command type:
	mkdir -p /usr/local/bin

	cp -i - /Users/<your user name>/Desktop/Crypt/crypt /usr/local/bin
	cp -i - /Users/<your user name>/Desktop/Crypt/Shred/shred /usr/local/bin

Finally, set the permissions:
	chmod 755 /usr/local/bin/crypt
	rehash


Instructions
------------
To use this command, simply type crypt then the files.
	crypt "encryption key" <file(s) to encrypt>

This command will determine whether the files you send to it are encrypted
or not. If they are not encrypted, crypt will encrypt them. If they are
encrypted, crypt will decrypt them.

Note on the encryption key: The encryption key can be made up any set of
alphanumeric characters. If you use a space, then you must use double quotes
or single quotes (" or ') around your key. Certain other characters in the
encryption key, such as the slash character may require single quotes. This
is true for both file encryption and decryption.

Crypt has the following flags:
	-d	Deletes the original file. Be careful, this option does
		not prompt to ask you if you are sure you want to delete
		the original.
	-e	Forces encryption.
	-r	Forces decryption.


Warning
-------
Don't forget your encryption key (password) or you will most likely not be
able to retrieve your files, unless you work for the NSA.

When you decrypt a file, if you have the wrong encryption key (password)
there will be no errors. However, the decrypted file will be gibberish.
Don't be deceived since the encryption key is determinant in the way the
data is encrypted and decrypted.


To Do
-----
Change automatic mode to NOT depend on file extension.
Increase encryption.
Add option to choose encryption.


Licensing
---------
This script is freeware. However, if you make any modifications, please
e-mail the author. And if you're in a really generous mood, I'll gladly
accept donations to my Paypal account.


Paypal Account Information
--------------------------
You can easily send me money by logging onto http://www.paypal.com/
Then login, click on the "Send Money" tab and enter my e-mail address, which
is btc@monaco.net. Thanks!


Acknowledgements
----------------
Thanks to John Pell for his contributions.


Disclaimer
----------
I express absolutely no guarantee of the results. Use these scripts at
your own risk.

Bruno Courbage
btc@monaco.net