I'm proposing a consulting engagement for a client with a proprietary project, which requires that I keep the project's work away from the Internet, due to confidentiality requirements.
I have two windows 10 computers (always updated) that I use on the Internet, and do not want to use any of them for this purpose. I'm thinking of buying a new laptop computer to be used exclusively for the new project. I use McAfee Total Protection, Malwarebytes, Hitman Pro, and Epic Privacy Browser (proxy mode) on the two computers connected to the Internet.
I'd prefer to use Microsoft Word and Excel, though I'm not attached to Microsoft products. I'll also need some specialty software (such as 3-D illustration software, and flowchart software), all of which I hope to load via CD/DVD, or transfer the downloaded installation files via flash drive from one of my online computers.
I will create, update, encrypt and store all the proprietary information files on flash drives that will never be inserted, if or when the new computer needs to connect to the Internet.
What what do you think of this strategy for keeping the proprietary project information secure?