According to the Saltzer paper on Multics. Identify architectural elements of the Multics design that leverage the security architecture concepts of (i) isolation/zones and (ii) interface restriction.  Saltzer mentions “Secondary Storage Residues” as a vulnerability in the system. Their exploitation would be a violation of what security property?  Identify a potential remedy to this vulnerability.    The Multics designers briefly considered a “Trap Extension” to their Access Control scheme. Discuss the positive and negative aspects of this approach related to the secure design principles of 1. least privilege, 2. economy of mechanism, and 3. complete mediation.

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