Truecrypt or close for iphone

Hello all,

After losing 2 laptops in the past, truecrypt for windows has become my best friend. I split my drive in 2 partition. One with vista and regular app while the other encrypted one contains all files, including work stuff. I would like to know if there are any apps in the app store that will allow me to create encrypted container limitless in size to the capability of iPhone flashdrive.

I know air share allows one to carry files on iPhone and you can set a password for uninvited users but it's not neccessarily an encrypted drive.

Please any one let Know what I should look for in iphone app store if one does exist. Thanks