encrypting/unencrypting files on the fly

encrypting/unencrypting files on the fly
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I need a script to encrypt Word or other text files on the fly.

My first option was to ask those who upload files to use MS Word encription when saving a file but since accessing the repository of files need also a password, I thought asking for two password was too much.

What I need is to make a repository of files uploaded by users with a list of files that they can also read.

Putting them in a server let search engines locate them and index them, so I need them encrypted. When somebody uploads a Word or Openoffice file it is encrypted on the fly and put in the list. Then when somebody clicks in the list the file is unscrypted also on the fly.

Any PHP function that can do this fast?

Thanks

Thread moved from 'PHP Coding' to 'Barter Zone' by Andrew.

Reason:

Hi,

PHP has extension for Mcrypt - Mcrypt Encryption Functions. Check if this extension available on your hosting and use it as described in manuals.. It's easy and fast. You can also use some command line Unix tools, like crypt.