Access control, security, and trust : a logical approach by Shiu-Kai Chin PDF

By Shiu-Kai Chin

ISBN-10: 1584888628

ISBN-13: 9781584888628

"Developed from the authors' classes at Syracuse college and the U.S. Air strength study Laboratory, entry regulate, protection, and belief: A Logical procedure equips readers with an entry keep an eye on common sense they could use to specify and make sure their defense designs. in the course of the textual content, the authors use a unmarried entry keep watch over common sense in line with an easy propositional modal logic.

The first a part of the e-book offers the syntax and semantics of entry keep an eye on good judgment, easy entry keep an eye on techniques, and an creation to confidentiality and integrity rules. the second one part covers entry keep watch over in networks, delegation, protocols, and using cryptography. within the 3rd part, the authors specialize in and digital machines. the ultimate half discusses confidentiality, integrity, and role-based entry control.

Taking a logical, rigorous method of entry regulate, this booklet exhibits how common sense is an invaluable software for interpreting safeguard designs and spelling out the stipulations upon which entry regulate judgements count. it really is designed for computing device engineers and desktop scientists who're chargeable for designing, enforcing, and verifying safe laptop and knowledge systems."--Pub. desc.  Read more...

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Extra info for Access control, security, and trust : a logical approach

Sample text

Unfortunately, natural language expressions have imprecise meanings. We need a way to unambiguously express the policies, trust assumptions, recognized authorities, and statements made by various principals and be able to justify the resulting access-control decisions. In this chapter, we introduced a language that allows us to express our policies, trust assumptions, recognized authorities, and statements in a precise and unambiguous way. Expressions in this language are given precise, mathematical meanings through the use of Kripke structures.

Specifically, we will use capitalized identifiers—such as Josh and Reader—for simple principal names. We will use lowercase identifiers—such as r, write, and rff —for propositional variables. 6 The following syntactic derivation demonstrates that (Jill says (r ⊃ (p ∨ q))) is a well-formed formula: Form (Princ says Form) (PName says Form) (Jill says Form) (Jill says (Form ⊃ Form)) (Jill says (PropVar ⊃ Form)) (Jill says (r ⊃ Form)) (Jill says (r ⊃ (Form ∨ Form))) (Jill says (r ⊃ (PropVar ∨ Form))) (Jill says (r ⊃ (p ∨ Form))) (Jill says (r ⊃ (p ∨ PropVar))) (Jill says (r ⊃ (p ∨ q))) ♦ In contrast, the following examples are not well-formed formulas, for the reasons stated: • Orly & Mitch is a principal expression, but not an access-control formula.

Controls: Formulas of the form P controls ϕ express a principal P’s jurisdiction or authority regarding the statement ϕ. We interpret P controls ϕ as syntactic sugar for the statement (P says ϕ) ⊃ ϕ, which captures the desired intuition: if the authority P says that ϕ is true, then ϕ is true. Thus, we give the meaning of P controls ϕ directly as the meaning of this rewriting: EM [[P controls ϕ]] = EM [[(P says ϕ) ⊃ ϕ]]. Speaks For: To understand the semantics of formulas with form P ⇒ Q, recall the purpose of such formulas: we wish to express a proxy relationship between P and Q that will permit us to safely attribute P’s statements to Q as well, independent of a particular world.

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Access control, security, and trust : a logical approach by Shiu-Kai Chin


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