Tel-Aviv University
School of Computer Science
Introduction to Modern Cryptography
0368.3049
Fall Semester 2009/2010
News
Moed A
If you plan on Moed B, better solve Moed A first!
Here is Moed A.
I also sent an email with sketch of solutions, but you'd better try to solve the exam on your own first.
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First page of the exam
Don't let us surprise you.
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Mistake in Q3, HW #4
Forgot to divide by |X|.
You'd better prove that 
; this will make the next step more plausible.
Thanks to Yossi for pointing this out.
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Sample exams
Here are three past exams you could use while preparing for the exam.
We don't have a whole lot of examples, but here are exams from the past years.
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A clarification about Assignment 3
Problem 1: more than one round is needed.
It might not be clear from Problem 1 itself, but Prudence is not required to recover 
in a single shot;
if, for example, in a single attempt she can rule out 10% of the remaining passwords in the dictionary, then with 
attempts she can single out the correct password.
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Due date of assignment #3
Postponed.
We decided you could use another week, so you may submit assignment 3 until December 30th.
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Assignment 2, problem 3
Please note that when you are asked to find collisions wrt a hash function H, namely
two mssgs m1,m2 s.t. H(m1)=H(m2), these messages can be of different lengths.
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Change of Deadline, Assignment 1
All problems except problem 3 (the substitution cipher questions) are due on Wed., Nov. 11, 6:20 pm, Israel time.
Problem 3 is due on Sunday, Nov. 15, 5 pm, Israel time.
In both cases, the destination is Rani Hod’s mailbox (second floor, Schreiber building).
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