I'm working on my first shopping cart web application (done in php) and have 
started to look into ways to secure it.  After reading up a little bit on 
mcrypt I have some basic questions about it:

1.  If I use mcrypt to encrypt user input before storing it in a database,  
do I have to use it in conjunction with a utility like PGP, or is mcrypt a 
self-contained encryption and decryption tool.

2.  One article I read almost immediately started talking about public and 
private keys, another did not mention them at all.  Does mcrypt require the 
use of 3rd party keys?

3.  If php scripts are used to decrypt data, where are these scripts kept?


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