olemus
X.805:
turbemõõtmetega kaitstav kiht, mis vastab võrgu seadmete ja vahendite rühmituste hierarhia tasemetele; turbekihid etalonmudelis: taristu kiht, teenuste kiht, rakenduste kiht
= security layers are a hierarchy of equipment and facilities groupings; each security layer has unique vulnerabilities, threats, and mitigations; infrastructure security enables services security enables applications security

ülevaateid
https://www.itu.int/ITU-T/worksem/ngn/200505/presentations/s5-zelstan.pdf

https://www.imf-conference.org/imf2007/X%20805-for-IMF_09_13.pdf

https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-X.805-200310-I!!PDF-E&type=items (see Chapter 7)