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A- Consider a program with two inputs and two outputs. (Lo, Ho) = Prog(Li, Hi).

 A- Consider a program with two inputs and two outputs. (Lo, Ho) = Prog(Li, Hi). Input Hi is a high confidentiality input and input Li is a low confidentiality input, and Ho is a private output and Lo is a public output. We say that there is information flow from input Hi to output Lo when which of the following is true?

 

1.    There exist inputs Li, Hi, Li', Hi' such that running the program on Prog(Li, Hi) produces outputs (Lo, Ho) and running Prog(Li', Hi') produces outputs (Lo', Ho') with Lo' different from Lo

 

2.    There exist inputs Li, Hi, Hi' such that running the program on Prog(Li, Hi) produces outputs (Lo, Ho) and running Prog(Li, Hi') produces outputs (Lo', Ho') with Lo' different from Lo

 

3.    There exist inputs Li, Hi, Hi' such that running the program on Prog(Li, Hi) produces outputs (Lo, Ho) and running Prog(Li, Hi') produces outputs (Lo, Ho'), so both have the same public output Lo

 

4.      For all inputs Li, Hi, Hi' running the program on Prog(Li, Hi) produces outputs (Lo, Ho) and running Prog(Li, Hi') produces outputs (Lo, Ho'), so both have the same public output Lo

 

 

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