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Re: [CISSP-D] Two questions about Security Models and Architecture in Al

from [Andrew McGregor] Network Security [Permanent Link]
Subject: Re: [CISSP-D] Two questions about Security Models and Architecture in All-In-One
Date: Tue, 16 Nov 2004 14:06:16 -0000 
1) It is A because the Biba model is all about integrity. Bell-Lapadula is all 
about confidentiality.

2) The two rules for the Biba model are 'No write up'-* integrity axiom and 'No 
read down' - simple integrity axiom.
    The three for Bell-Lapadula are 'No read up' - simple security 
rule/property, 'no write down' - * property, 'no write up and no read down' - 
strong star property.  Therefore, D should be the answer

Mags
  ----- Original Message ----- 
  From: wang shujing 
  To: Cissp-yahoogroup 
  Sent: Tuesday, November 16, 2004 4:28 AM
  Subject: [CISSP-D] Two questions about Security Models and Architecture in 
All-In-One


  Hi, everybody,

  I read the All In One. The following two questions confused me. would you 
please help me?

  Chap.5---22
  Which best describes the *-integrity axiom?
  A. No wirte up in the Biba model
  B. No read down in the Biba model
  C. No write down in the Bell-lapadula model
  D. No read up in the Bell-lapadula model

  The answer is A. Why not C?

  Chap.5---23
  Which best describes the simple security rule?
  A. No wirte up in the Biba model
  B. No read down in the Biba model
  C. No write down in the Bell-lapadula model
  D. No read up in the Bell-lapadula model

  The answer is D. Why not B?

  The Bell-lapadula has the simple security rule, the *-property rule.
  The Biba has two integrity rules.

  I think the first one is because of the "integrity". What's the reason for 
the second one? Is there special names for Biba rules? 

  Thanks a lot.

  Shujing

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