Sharing encrypted files with a Windows user

[shep]

60 Minutes interviewed Christopher Wray:
Christopher Wray exit interview with 60 Minutes - youtube

When ask what he felt was the largest threat to the U.S., he listed Mainland China's infiltration of all the major Internet Service providers.

I'm working on a patent and my patent lawyer is using a frozen version of Windows 10. He had to freeze the updates because his MSOffice version would otherwise quit working

I have about 2 years worth of work into the project and it would all go down the toilet if my design showed up in China. My patent attorney is open to encrypting the patent application documents that we are exchanging.

I currently use libressl 4.0/openssl 3.0.15 LTS with the following to encrypt/decrypt:

openssl enc -aes-256-cbc -e -in test.docx -out test.aes
openssl aes-256-cbc -d -in test.aes -out test.docx.

From what I can gather, Microsoft's native encryption does not work with OpenSSL/LibreSSL. There are Windows binaries for OpenSSL and LibreSSL.

Would installing a Windows Binary be the easist way to share encrypted files?

Other suggestions?

Thanks in advance.

[J65nko]

Sending it encrypted will protect you during transmission or emailing.

However, when your lawyer decrypts your file it will be readable for for an intruder on his computer of network.

[shep]

Thanks.

My lawyer works from home. He registered his domain but I have not broached how secure his home network is. I'm thinking the scheme in the OP is the best I can do.

[Onauk]

Originally Posted by shep

Thanks.

My lawyer works from home. He registered his domain but I have not broached how secure his home network is. I'm thinking the scheme in the OP is the best I can do.

I don't know how tech savvy your lawyer is so it might be easier for them to use EFS on MS Windows which is just RSA. You will need to share RSA public keys but all is covered on this MS article:

https://www.microsoft.com/en-us/wind...o-encrypt-file