Q4. [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. Justify your answer. (Security level is represented as (clearance, category set). Let a subject S have a security level of (Ls, Cs), where Ls is the clearance of S and C, is the category set. There are four levels of clearance from the highest to the lowest: TOP SECRET > SECRET > CONFIDENTIAL > UNCLASSIFIED. The security condition says that S can read O if and only if Ls > Lo and Cs 2 Co. In other words, the security level (Ls, Cs) dominates the security level (Lo, Co). In contrast, S can write O if and only if Lo > Ls and Co 2 Cs. In other words, the security level (Lo, Co) dominates the security level (L5, Cs).)
Q4. [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. Justify your answer. (Security level is represented as (clearance, category set). Let a subject S have a security level of (Ls, Cs), where Ls is the clearance of S and C, is the category set. There are four levels of clearance from the highest to the lowest: TOP SECRET > SECRET > CONFIDENTIAL > UNCLASSIFIED. The security condition says that S can read O if and only if Ls > Lo and Cs 2 Co. In other words, the security level (Ls, Cs) dominates the security level (Lo, Co). In contrast, S can write O if and only if Lo > Ls and Co 2 Cs. In other words, the security level (Lo, Co) dominates the security level (L5, Cs).)
Related questions
Question
a) John, cleared for (TOP SECRET, { A, C }), wants to access DocA, a document classified (SECRET,
{ C }).
b) Carol, cleared for (CONFIDENTIAL, { C }), want to access DocB, a document classified
(CONFIDENTIAL, { A }).
c) Sammi, cleared for (TOP SECRET, { A, C }), wants to access DocC, a document classified
(CONFIDENTIAL, { A, C }).
d) Ellen, who has no clearance (and so works at the UNCLASSIFIED level), wants to access DocD,
a document classified (CONFIDENTIAL, { A }).
![Q4. [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. Justify your answer.
(Security level is represented as (clearance, category set). Let a subject S have a security level of (Ls, Cs), where
Ls is the clearance of S and C, is the category set. There are four levels of clearance from the highest to the
lowest: TOP SECRET > SECRET > CONFIDENTIAL > UNCLASSIFIED. The security condition says that S can read O if
and only if Ls > Lo and Cs 2 Co. In other words, the security level (Ls, Cs) dominates the security level (Lo, Co). In
contrast, S can write O if and only if Lo > Ls and Co 2 Cs. In other words, the security level (Lo, Co) dominates the
security level (L5, Cs).)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F82aefee1-a4fd-40e7-8b3f-97f92bfc6e2a%2Fdf85c4f3-9e8d-4fd8-9eed-e5f1feb03ab9%2Feam8mdo_processed.png&w=3840&q=75)
Transcribed Image Text:Q4. [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. Justify your answer.
(Security level is represented as (clearance, category set). Let a subject S have a security level of (Ls, Cs), where
Ls is the clearance of S and C, is the category set. There are four levels of clearance from the highest to the
lowest: TOP SECRET > SECRET > CONFIDENTIAL > UNCLASSIFIED. The security condition says that S can read O if
and only if Ls > Lo and Cs 2 Co. In other words, the security level (Ls, Cs) dominates the security level (Lo, Co). In
contrast, S can write O if and only if Lo > Ls and Co 2 Cs. In other words, the security level (Lo, Co) dominates the
security level (L5, Cs).)
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