In PKI, what does the term "token" refer to?

In the context of Public Key Infrastructure (PKI), the term "token" refers to a physical item used to store encryption keys. These tokens are often hardware-based devices, such as smart cards or USB devices, that securely hold cryptographic keys and may also require user authentication, such as a PIN or biometric data, to activate the keys. The purpose of these tokens is to enhance security by ensuring that sensitive encryption keys are stored in a secure manner and are only accessible to authorized users.

Tokens are designed to mitigate risks associated with key exposure and to prevent unauthorized access to cryptographic processes. They play a significant role in identity verification and secure communications, as they can be used for tasks like signing digital documents or encrypting information.

Other options discuss concepts related to PKI but don't define "token" accurately within this framework. Digital signatures and temporary codes may pertain to secure communications, while guidelines for implementing PKI represent best practices or standards rather than a physical embodiment of encryption keys.