Seeing that electron application code can easily be inspected inside the asar container (I.e. you can't trust the client) : How would you approach the problem

Seeing that electron application code can easily be inspected inside the asar container (I.e. you can't trust the client) : How would you approach the problem to encrypt secrets locally? The only approach I could come up with involves receiving a symmetric key from a server with certificate pinning, but even that seems quite insecure).