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I am trying to figure out an approach for encrypting files for other users using a PHP interface, while keeping their password private from system administrators (similar to Dropbox). I basically need to store files for users, yet keep their passwords unknown. Any suggestions?
Use base_64 encoding with a private key.
http://php.net/manual/en/function.base64-encode.php
Check the User Contributed Codes on the page for using a custom key and salting for additional security