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I've I have some scans of sensitive documents in image format such as jpg png etc. When I open up the folder containing them which is in a truecrypt file, will nautilus create a temporary version of the scan or even a thumbnail of the scan on the computer which the file was opened on?

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TrueCrypt won't, but I don't know about Nautilus. If you want to make sure, check all the files that have been modified during your session:

find /tmp /var/tmp ~/ -type f -mmin 42

where 42 is the number of minutes you've been logged in (the last command might help if you didn't check the time). You can search for image specifically:

find /tmp /var/tmp ~/ -type f \( -name '*.jpg' -o -name '*.png' \) -mmin 42

Of course, if you don't trust the administrators of the computer, you'll never know if they secretly keep a copy of every file that's been on the machine ever.

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Don't forget to clean out ~/.thumbnails (or possibly ~/.gnome-thumbnails). –  charlesbridge Jun 6 '11 at 18:39
    
Ah, ~/.thumbnails has thumbnails of my sensitive scans... Will those locations be the only locations where thumbnails are created? –  oshirowanen Jun 13 '11 at 8:03
    
Looks like thumbnails do get created. How do I delete them securely so they cannot be undeleted? –  oshirowanen Jun 19 '11 at 8:28
    
@oshirowanen Replace ~/.thumbnails by a symbolic link to a directory inside your TrueCrypt volume. –  Gilles Jun 19 '11 at 9:43
    
@Gilles, not sure how to go about doing that. –  oshirowanen Jun 19 '11 at 12:28

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