Hi,
If you are using myetherwallet then you known that you make sure your private key file never got in hands of other people.
Currently I'm busy with a project to create extra security on your private key file so you can leave the file safely on your computer.
The first test results are positive and it's almost finished. Next week I give more information. For now I can tell you that it will be a free tool.
If you're interested please follow me.
Donations are welcome :)
Eth: 0xBe31fc364A18ac657365E37FDc32aF96586c98FC