A mind–reading brain implant that comes with password protection

https://archive.md/8PBtz

> When a participant imagined the password ‘Chitty-Chitty-Bang-Bang’ (the name of an English-language children’s novel) the BCI recognized it with an accuracy of more than 98%.

I wonder how difficult having a conversation about that novel (or film) would be. I imagine you would accidentally start saying your thoughts out loud.

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, two UTF-16 and one unprintable ANSI character.

Error: You may not use any password you've ever used (or imagined) previously. Please try again."

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.