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multiple independent levels of security wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 overview toggle overview subsection 1 1 neat 1 2 trustworthiness 1 3 companies 2 mils research and technology 3 see also 4 references toggle the table of contents multiple independent levels of security 1 language deutsch edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia computer security architecture multiple independent levels of security safety mils is a high assurance security architecture based on the concepts of separation 1 and controlled information flow it is implemented by separation mechanisms that support both untrusted and trustworthy components ensuring that the total security solution is non bypassable evaluatable always invoked and tamperproof overview edit a mils solution allows for independent evaluation of security components and trusted composition 2 3 mils builds on the older bell and la padula theories on secure systems that represent the foundational theories of the dod orange book a mils system employs one or more separation mechanisms e g separation kernel partitioning communication system physical separation to maintain assured data and process separation a mils system supports enforcement of one or more application system specific security policies by authorizing information flow only between components in the same security domain or through trustworthy security monitors e g access control guards downgraders crypto devices etc neat edit properties non bypassable a component can not use another communication path including lower level mechanisms to bypass the security monitor evaluatable any trusted component can be evaluated to the level of assurance required of that component this means the components are modular well designed well specified well implemented small low complexity etc always invoked each and every access message is checked by the appropriate security monitors i e a security monitor will not just check on a first access and then pass all subsequent accesses messages through tamperproof the system controls modify rights to the security monitor code configuration and data preventing unauthorized changes a convenient acronym for these characteristics is neat trustworthiness edit trustworthy means that the component have been certified to satisfy well defined security policies to a level of assurance commensurate with the level of risk for that component e g we can have single level access control guards evaluated at cc eal4 separation mechanisms evaluated at high robustness two level separation guards at eal 5 and type i crypto all in the same mils system untrusted means that we have no confidence that the system meets its specification with respect to the security policy companies edit the following companies have mils separation kernel products green hills software lynuxworks sysgo wind river systems bertin technologies ok labs 4 5 companies with other separation methods creating mils products thales 6 mils research and technology edit the mils community the mils community is a global international open membership not for profit competence network on mils architecture and technologies research projects euro mils secure european virtualisation for trustworthy applications in critical domains d mils distributed mils for dependable information and communication infrastructures certmils compositional security certification for medium to high assurance cots based systems in environments with emerging threats see also edit multiple levels of security secure by design references edit john rushby 1981 design and verification of secure systems pdf proc 8th acm symposium on operating system principles pp 12 21 w s harrison n hanebutte p oman j alves foss october 2005 the mils architecture for a secure global information grid pdf crosstalk 18 10 20 24 archived from the original pdf on 2012 12 03 alves foss w s harrison p oman and c taylor 2007 the mils architecture for high assurance embedded systems international journal of embedded systems 2 3 4 239 247 citeseerx 10 1 1 76 6810 doi 10 1504 ijes 2006 014859 cite journal cite uses deprecated parameter citeseerx help cs1 maint multiple names authors list link link removed sel4 secure embedded l4 ssrg nicta archived from the original on 2014 04 10 retrieved 2014 05 17 martello rushby j 2008 separation and integration in mils the mils constitution technical report sri csl 08 xx sri international retrieved from https en wikipedia org w index php title multiple_independent_levels_of_security oldid 1373194189 categories operating system security operating system technology hidden categories articles with short description short description is different from wikidata cs1 errors deprecated parameters cs1 maint multiple names authors list deprecated archive template links this page was last edited on 4 september 2026 at 14 12 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics 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