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Discuss different security models in details.

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By By Team EasyExamNotes

Bell -LaPadula Model (BLP):

a. Purpose:

b. Description:

  • Formal rules for security using labels on objects and clearances for users.
  • Labels range from most sensitive to least sensitive.

c. Key Point:

  • No clear distinction between protection and security.

Biba Model:

a. Purpose:

  • Ensures data integrity in computer systems.

b. Description:

  • Groups data and users into ordered integrity levels.
  • Users can’t corrupt data at higher levels or be corrupted by lower-level data.

c. Key Point:

Brewer and Nash Model (Chinese Wall Model):

a. Purpose:

  • Dynamic information security controls to prevent conflicts of interest.

b. Description:

  • Designed for commercial organizations to handle conflicts of interest.
  • Information flow controls prevent conflicts.

c. Key Point:

  • Commonly used in consulting and accounting firms.
  • Aims to avoid situations where information flow could lead to a conflict of interest.

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