<commit_before># Implement a Defensive Security System

This assignment will help you understand security mechanisms. You will be
guided through the steps of creating a reference monitor using the security
layer functionality in Repy V2. A reference monitor is an access control
concept that refers to an abstract machine that mediates all access to
objects by subjects. This can be used to allow, deny, or change the
behavior of any set of calls. While not a perfect way of validating your
reference monitor, it is useful to create test cases to see whether your
security layer will work as expected (the test cases may be turned in as
part of the next assignment). Please ask your instructor if test cases are available to you, some instructors may provide with test cases.

This assignment is intended to reinforce concepts about access control and
reference monitors in a hands-on manner. <commit_msg>Update LeftPadPartOne.md<commit_after># Implement a Defensive Security System

This assignment will help you understand security mechanisms. You will be
guided through the steps of creating a reference monitor using the security
layer functionality in Repy V2. A reference monitor is an access control
concept that refers to an abstract machine that mediates all access to
objects by subjects. This can be used to allow, deny, or change the
behavior of any set of calls. While not a perfect way of validating your
reference monitor, it is useful to create test cases to see whether your
security layer will work as expected (the test cases may be turned in as
part of the next assignment). 

This assignment is intended to reinforce concepts about access control and
reference monitors in a hands-on manner. 
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