Th zr trst scrty mdl, ls knwn s zr trst rchtctr (ZT), nd prmtrlss scrty dscrbs n pprch t th strtgy, dsgn nd mplmnttn f T systms. Th mn cncpt bhnd th zr trst scrty mdl s "nvr trst, lwys vrfy", whch mns tht srs nd dvcs shld nt b trstd by dflt, vn f thy r cnnctd t prmssnd ntwrk sch s crprt LN nd vn f thy wr prvsly vrfd.
ZT s mplmntd by stblshng strng dntty vrfctn, vldtng dvc cmplnc prr t grntng ccss, nd nsrng lst prvlg ccss t nly xplctly-thrzd rsrcs. Mst mdrn crprt ntwrks cnsst f mny ntrcnnctd zns, cld srvcs nd nfrstrctr, cnnctns t rmt nd mbl nvrnmnts, nd cnnctns t nn-cnvntnl T, sch s T dvcs.
Th rsnng fr zr trst s tht th trdtnl pprch – trstng srs nd dvcs wthn ntnl "crprt prmtr", r srs nd dvcs cnnctd v VPN – s nt sffcnt n th cmplx nvrnmnt f crprt ntwrk. Th zr trst pprch dvcts mtl thntctn, ncldng chckng th dntty nd ntgrty f srs nd dvcs wtht rspct t lctn, nd prvdng ccss t pplctns nd srvcs bsd n th cnfdnc f sr nd dvc dntty nd dvc hlth n cmbntn wth sr thntctn. Th zr trst rchtctr hs bn prpsd fr s n spcfc rs sch s spply chns.
Th prncpls f zr trst cn b ppld t dt ccss, nd t th mngmnt f dt. Ths brngs bt zr trst dt scrty whr vry rqst t ccss th dt nds t b thntctd dynmclly nd nsr lst prvlgd ccss t rsrcs. n rdr t dtrmn f ccss cn b grntd, plcs cn b ppld bsd n th ttrbts f th dt, wh th sr s, nd th typ f nvrnmnt sng ttrbt-Bsd ccss Cntrl (BC). Ths zr-trst dt scrty pprch cn prtct ccss t th dt.
Zr trst ntwrk ccss (ZTN) s nt synnym fr th zr trst scrty mdl r zr trst rchtctr. nstd, t's mrkt tht cnssts f rmt ccss prdcts blt wth zr trst prncpls, lrgly drvd frm th sftwr-dfnd prmtr spcfctn dvlpd by th Cld Scrty llnc (CS).