1

I am reading CISSP and more specifically the Biba model. Biba has some basic properties:

  • The Simple Integrity Property states that a subject cannot read an object at a lower integrity level (no read-down).
  • The * (star) Integrity Property states that a subject cannot modify an object a a higher integrity level (no write-up).

I am a little confused about the first property.

Improve this question
2

The idea of the "no read down" principle is simply that information produced at a lower level may be tainted, and should not be consumed by a member of a higher tier in the hierarchy.

A classical example is that a priest may write a prayerbook for a farmer, but should not accept religious ideas from the farmer.

Improve this answer
1
  • 2
    The reason for this is to avoid someone from a higher integrity level being corrupted by something written at a lower level. It prevents bias, and less reputable information from being accidentally re-published by a more reputable author than the source material deserves. – Daisetsu Dec 2 '18 at 21:56

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.