What does a passwordless system primarily rely on to authenticate users?
Knowledge-based security questions and answers
Alternative authentication factors such as biometrics or hardware/software tokens
Strong, complex passwords that must be changed regularly
SMS one-time passcodes sent to the user's phone
Passwordless authentication removes memorized secrets entirely. Instead, the user proves identity with something they have or are-for example, a hardware token storing a private key that is unlocked by a biometric check in a smartphone app. Eliminating passwords mitigates risks such as credential reuse, phishing, and brute-force guessing. Strong, complex passwords, security questions, and SMS one-time codes all still involve knowledge-based or phishable secrets, so they are not truly passwordless.
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