For each paper, you should submit two text files via the Gradescope submission web site, as described below. The submission is due before lecture. (The Gradescope entry code for 6.5660 is 3JZ23X.)
answer.txt
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question.txt
. You cannot use the question below. To the
extent possible, during lecture we will try to answer these questions. If
you submit your question before midnight the day before lecture, then there
is a chance we will answer by email. Below, we have included the questions
we've received from students in past years (when available), along with
answers to those questions, in case you find it helpful.
Lecture 12
Suppose that the developer implements the PIN-protected backup HSM by comparing the supplied PIN code to the stored PIN code one digit at a time, from left to right, returning an error as soon as it finds a mismatched digit. Explain why this implementation should not satisfy the paper's IPR definition for the specification shown in Figure 2, and explain what part of the proof would fail.