Is there any way to encrypt your brain's traffic and then handshake a decryption key to the implant to ensure that accidental activations merely result in garbage output?

I wonder what happens if you tell the user not to think of their password.

Having just gone through it today, I'm imagining getting this from my shiny new neural interface:

"Due to unusual account activity, you must change your password. Please enter 12 characters with at least three upper case and four lowercase letters, punctuation and two UTF-16 and one unprintable ANSI character."