Nexus Authorization Logic (NAL): Design Rationale and Applications
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Schneider, Fred B.; Walsh, Kevin; Sirer, Emin Gun
Nexus Authorization Logic (NAL) provides a principled basis for specifying and reasoning about credentials and authorization policies. It extends prior access control logics based on "says" and "speaksfor" operators, enabling within a single framework request authorization to depend on (i) the source or pedigree of the requester, (ii) the outcome of performing an analysis on the requester, or (iii) the use of trusted software to encapsulate or modify the requester. Prototype document-viewer applications that enforce integrity and confidentiality of document contents - all implemented on the Nexus operating system - illustrate the convenience and expressive power of this approach to authorization.
Categories and Subject Descriptors: D.2.0 [General]: Protection mechanisms; D.4.6 [Security and Protection]: Access controls
Supported in part by NICECAP cooperative agreement FA8750-07-2-0037 administered by AFRL, AFOSR grant F9550-06-0019, National Science Foundation grants 0430161 and CCF-04424422(TRUST), ONR grant N00014-01-1-0968, and grants from Microsoft and Intel.
Authorization Logic; Credentials-based Authorizations; CDD; Security