In authentication, which factor is described as something you have?

• A. Something you know
• B. Something you have
• C. Something you are
• D. Something you do

Answer: (B)

Authentication relies on different proof factors. When a factor is described as something you have, it means a physical object the user must possess to gain access. This includes hardware tokens, smart cards, or a mobile device that can produce or receive a one-time code. This is different from something you know (like a password or PIN), something you are (biometric traits such as a fingerprint), or something you do (behavioral patterns like typing speed). The reason this fits the description is that it centers on possession of a tangible item rather than knowledge, inherent characteristics, or actions. In practice, using something you have adds a second factor to verify identity, complementing other factors for stronger security.