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?
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:
where 42 is the number of minutes you've been logged in (the
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.