olemus
nelja autentimistegurit rakendav, näiteks
omamis-, teadmis-, olemus- ja kohategurit
rakendav autentimine
=
the use of four types of identity-confirming credentials, typically categorized as knowledge, possession, inherence and location factors

ülevaateid
https://en.wikipedia.org/wiki/Multi-factor_authentication

https://security.stackexchange.com/questions/68009/four-factor-authentication

https://www.osti.gov/servlets/purl/1116672

näiteid
https://www.ijstr.org/final-print/mar2018/A-Robust-And-Scalable-Four-Factor-Authentication-Architecture-To-Enhance-Security-For-Mobile-Online-Transaction.pdf

https://www.ijeter.everscience.org/Manuscripts/Volume-6/Issue-4/Vol-6-issue-4-M-30.pdf

https://traitware.com/up-to-4-factor-multifactor-authentication/

vt ka
- mitmikautentimine