Account logins, Otps, security questions, all help in this regard.
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Finally, in some systems, Otps are printed on paper that the user is required to carry.
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This is necessary because
otherwise it would be easy to predict future Otps by observing previous ones.
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Yet other systems generate Otps on the server-side
and send them to the user using an out-of-band channel such as SMS messaging.
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Some systems use special electronic security
tokens that the user carries and that generate Otps and show them using a small display.
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Mathematical algorithm-
to generate a new password based on the previous password(Otps are effectively a chain
and must be used in a predefined order).
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Using a mathematical algorithm to generate a
new password based on the previous password(Otps are effectively a chain and
must be used in a predefined order).