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Given the security levels TOP SECRET, SECRET, CONFIDENTIAL, and UNCLASSIFIED (ordered from highest to lowest), and the categories A, B, and C, specify what type of access (read, write, both, or neither) is allowed in each of the following situations. Assume that discretionary access controls allow anyone access unless otherwise specified.
a. Paul, cleared for (TOP SECRET, { A, C }), wants to access a document classified (SECRET, { B, C }).
b. Anna, cleared for (CONFIDENTIAL, {C}), wants to access a document classified (CONFIDENTIAL, {B}).
c. Jesse, cleared for (SECRET, {C}), wants to access a document classsified (CONFIDENTIAL, {C}).
d. Sammi, cleared for (TOP SECRET, {A, C}), wants to access a document classsified (CONFIDENTIAL, {A}).
e. Robin, who has no clearances (and so works at the UNCLASSIFIED level), wants to access a document classified (CONFIDENTIAL, {B}).

Respuesta :

DJ0the0alpha

Answer:

1 – Paul will be able to READ the document classified (SECRET, {B,C}) (No read up, no write down!)

2 – Anna will not be able to access the document since she is not in the category-set

3 – Jesse will be able to READ the document classified (CONFIDENTIAL, {C}) (No read up, no write down!)

4 – Sammi will be able to READ the document classified (confidential, {A}) (No read up, no write down!)

5 – Robin will be able to WRITE do this document, but not read it (No read up, no write down!)

Explanation:

1 – Paul will be able to READ the document classified (SECRET, {B,C}) (No read up, no write down!)

2 – Anna will not be able to access the document since she is not in the category-set

3 – Jesse will be able to READ the document classified (CONFIDENTIAL, {C}) (No read up, no write down!)

4 – Sammi will be able to READ the document classified (confidential, {A}) (No read up, no write down!)

5 – Robin will be able to WRITE do this document, but not read it (No read up, no write down!)

The subject can communicate to the object if indeed the subject compartment dominates the object compartment, per a basic security property. The *-property states that the topic can write to an object if the item compartment dominates the subject sector. Let (L, C) and (L', C') be lockers for separate things.  [tex]\bold{((L,C)\ dominates \ (L',C') \Leftrightarrow L'\leq L \ and\ C'\subseteq C)}[/tex] is the concept we will use to characterize a sort of access that the following statements possess.

  • Paul has been unable to view or write to the file since his clearance level doesn't override his level of classification of the document and vice versa.
  • Anna has been unable to view or write to the document because Anna Paul's clearance level does not override the level of classification of a document as well as vice versa.
  • Jesse, who's been authorized as [tex](SECRET, \{C\})[/tex], wishes to read a material classified as [tex](CONFIDENTIAL\{C\})[/tex]. Jesse has only understood information and ideas presented to [tex](CONFIDENTIAL\{C\})[/tex].
  • Sammi, who is authorized with [tex](TOP SECRET,\{A, C\})[/tex], wishes to view a document classified as [tex](CONFIDENTIAL\{A\})[/tex]. Sammi has only understood the information and ideas presented to [tex](CONFIDENTIAL\{A\})[/tex].
  • Robin, that has no credentials (and thus operates just at UNCLASSIFIED level), wishes to see a file marked [tex](CONFIDENTIAL,\{B\})[/tex]. Robin has only write access to [tex](CONFIDENTIAL\{B\})[/tex].

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