I used to keep a diary this way, and eventually decided on using an encrypted Word document. The encryption in Office used to be very weak in early versions, bu

I used to keep a diary this way, and eventually decided on using an encrypted Word document. The encryption in Office used to be very weak in early versions, but it's much better these days. In recent versions of Office (from 2007 onwards, using the DOCX format), by default it uses AES in CBC mode, with an SHA-1 based key derivation function [1]. So with a sufficiently complex password your documents will be resistant to cracking. But of course you are still vulnerable to keyloggers and the like. [1] https://msdn.microsoft.com/en-us/library/office/cc313071(v=office.12).aspx https://msdn.microsoft.com/en-us/library/office/cc313071(v=o...