* [[SSI]] (''Self-Sovereign Identity'') -
* [[SSO]] (''Single sign-on'') -
* [[STIG]] (''Security Technical Implementation Guides'') - USA:n puolustusministeriön (DoD) konfiguraatiostandardit.
* [[Stork]] (''Secure idenTity acrOss boRders linKed'') -
* [[Sulkulista]] - eli [[CRL]]