Bonafide theorem

The Bonafide theorem is a principle in electrical engineering and data communications that asserts a device's genuine identity or deixis can be verified by certain unique properties—such as cryptographic keys or unique characteristics—making it resistant to impersonation or counterfeit. Essentially, it ensures that a device claiming to be genuine can be reliably distinguished from a fake, based on its inherent attributes, thereby enhancing security and trust in communication systems. This theorem underpins methods for authentication, ensuring that parties involved are legitimate entities.