How to prevent sensitive information is displayed when the extension 'exe' is modified to 'txt' on windows?

[Baz via Digitalmars-d-learn]

On Tuesday, 6 January 2015 at 17:15:28 UTC, FrankLike wrote:
> How to prevent sensitive information is displayed when the 
> extension 'exe' is modified to 'txt' on windows?
>
> If you build a exe ,such as which can get Data from 
> DataBase,when you modify the exe's  extension to 'txt',
> and you open it by notepad.exe (on windows),you will find the 
> info,it's important for me,so how to stop  the info to display  
> ?

Notepad to display the infos ? are you serious ? Have you ever 
heard about IDA and more globally about the disassemblers ? In a 
disassembler you always have a "strings" display, in IDA you have 
the "Names"... which are basically like "strings" with infos 
about where they are used. It will blow your mind...

To hide the infos you can also (I've seen people say that you can 
use a packer) encrypt the strings and decode them at run-time 
(e.g base64, a simple XOR, etc) and use the import() idiom: 
https://p0nce.github.io/d-idioms/#Embed-a-dynamic-library-in-an-executable 
to import the compiled things.

I've made a simple software in this spirit, even if it's not made 
to encrypt/hide (it's more globally a resource manager), it can 
be used to hide the strings since it encodes in base 85 and base 
64: https://github.com/BBasile/Resource.d