You're using dmcrypt and ecryptfs?

You have something in your setup that I'm not understanding.

If the unmounted ~/Private directory has 500 permissions, a privileged
user (root, sudo) or a program with privileges is writing that file.
I do not believe this is a bug in ecryptfs-utils.

:-Dustin

-- 
~/Private: one file visible/readable when not mounted
https://bugs.launchpad.net/bugs/290983
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Status in “ecryptfs-utils” source package in Ubuntu: Incomplete

Bug description:
I am using the latest 8.10.
When the user with a private directory is not logged in, root can have a look 
in the Private directory and see exactly one file in clear:

lrwxrwxrwx 1 norbert norbert     28 2008-10-15 23:19 THIS DIRECTORY HAS BEEN 
UNMOUNTED TO PROTECT YOUR DATA --  Run mount.ecryptfs_private to mount again -> 
/sbin/mount.ecryptfs_private
-rw------- 1 norbert norbert 421581 2008-10-15 22:15 x.png.nc


Here the file x.png.nc is the one. 
This file can be extracted and viewed.

Regarding the nature of this directory, I regard this problem as security 
relevant.

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