C++ project application , to be uploaded to Microsoft store. Need security features added -- 2

Job ID: 34983284

Budget: £250 – £750 GBP

I've got a application created in c++ that allows for images to be iterated onto the screen.

As I'll be putting it onto a new server I'd like new security features added to make it 100% secure from hacking I'd also like small additional amendments to be made, some html and css amendments(nothing major)

I'll then need help adding it onto the Microsoft store to make it readily available. I have the source code so you can view

Need an accurate qoute and general gist of what you'll be doing for the security, nothing extremely detailed.