Already exists, there are totally secure email systems available where even the hosts of your data cannot decrypt your files if you lose your password. The security offered is intrinsically related to the complexity of your password, any password that can be hacked with a dictionary attack or simple variants of a dictionary attack (don't imagine that adding numbers instead of letters offers you any real added security) is too poor to be used in government or the diplomatic services and if they are too thick to remember a more complex password then we should really be asking if they are smart enough to be representing us internationally.
Likewise for file security on laptops there already exists publicly available seriously secure software that cannot be hacked in any reasonable timescale if you have a good high quality password. These systems even allow for plausible deniability, why governments are not using these systems for secure communication and securing mobile data sources god only knows.