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Which among the following categories include a badge for authentication?

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Which among the following categories include a badge for authentication?

(a) Traits

(b) Knowledge

(c) Token

(d) Behaviour

The question was posed to me in an interview for job.

I need to ask this question from Next Generation Wireless Network topic in portion Next Generation Wireless Network of Cognitive Radio

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Best answer
Right answer is (c) Token

Easiest explanation: The major categories of user authentication are knowledge, traits, token, and behaviour. PINs and passwords are associated with knowledge. Keys and badges are associated with tokens. Behaviour involves usage patterns. Features such as voice and fingerprint are used to sense behaviour. An implementation including four categories offers strong protection.

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