> Unfortunately, the .prn is a directory and it's size is around 70 Gb. > So I guess tar/untar it every time I need access to it is the only option?
If it's only the content of the files you need encrypted, then you can recursively encrypt all of the files with $ cd ~/.prn $ for file in $(find -type f); do gpg -c $file && srm $file; done like I suggested, and then decrypt individual files as needed. However, if you don't want anyone to even see the directory tree, then I don't see a way around encrypting and decrypting the entire tar archive when you need it. With 70 Gb that could take a while. secure-deleting 70 Gb with srm could take a while too. Maybe you could save time by separating .prn into multiple directories and creating a separate tar for each, so that you don't have to decrypt all 70 Gb every time.
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