Would it be possible to ensure that documents used on a personal PC connected to the internet, could be used securely without the danger of an eavesdropper obtaining access to the file or the danger of files being created in the temp folder and being accessible to someone else who logs in later?
I've considered keeping the files in a Truecrypt container and using a virtual keyboard to enter the password. But if I access a Word file in the container, won't temporary files be created in the temp directory? Would using a sandbox help in this case?
What if I access the file from a Truecrypt container in Linux instead?
In short, what would be a good way to ensure that any confidential files will be secure even if the system is compromised?