What can be used alongside a password in PKI for authentication?

Study for the Fortinet FortiAnalyzer 6.4 Test. Use interactive flashcards and multiple choice questions with detailed explanations. Be exam-ready!

In Public Key Infrastructure (PKI), authentication is often enhanced through the use of a digital certificate in conjunction with a password. This method utilizes asymmetric encryption, where the digital certificate contains the public key associated with the user's private key.

When a user is authenticated, they provide their password to prove they know it, and the digital certificate confirms their identity through the possession of the corresponding private key. This two-factor approach ensures a higher level of security than using a password alone. The password acts as one form of knowledge-based authentication, while the digital certificate provides a second form that relies on possession of a private key, resulting in a more robust defense against unauthorized access.

The other options may include elements of user verification, but they do not combine the strong cryptographic principles found in PKI. For example, security questions can be easily guessed or researched, and RSA tokens serve as a different method of two-factor authentication but not necessarily in combination with a password as part of a PKI framework. Similarly, combining just a password and username does not adequately secure access, as these components alone can be more susceptible to breaches.

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