1 Exercises 1. Intersection attacks Recall the correlation matrices from lectures for sharing partial informa- tion about a secret number. Below are the correlations tables for a number chosen (uniformly) at random out of 1-7. P Even 1 2 3 4 5 6 7 0 1 4567231 0 1 0 1 0 Odd 1 0 1 0 1 0 1 PT Even ^ 0 mod 3 0 0 0 0 ? ? ? T 1 2 ? ? 3 4 5 6 7 0 mod 3 0 0 1 0 0 1 0 Even A Odd A (0 mod 3) 0 mod 3 0 0 1 0 0 1 1 0 ? ? ? ? (0 mod 3) 1 1 0 1 ? ? ? 1 0 1 Odd A (0 mod 3) 1 0 0
1 Exercises 1. Intersection attacks Recall the correlation matrices from lectures for sharing partial informa- tion about a secret number. Below are the correlations tables for a number chosen (uniformly) at random out of 1-7. P Even 1 2 3 4 5 6 7 0 1 4567231 0 1 0 1 0 Odd 1 0 1 0 1 0 1 PT Even ^ 0 mod 3 0 0 0 0 ? ? ? T 1 2 ? ? 3 4 5 6 7 0 mod 3 0 0 1 0 0 1 0 Even A Odd A (0 mod 3) 0 mod 3 0 0 1 0 0 1 1 0 ? ? ? ? (0 mod 3) 1 1 0 1 ? ? ? 1 0 1 Odd A (0 mod 3) 1 0 0
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Exercises
1. Intersection attacks
Recall the correlation matrices from lectures for sharing partial informa-
tion about a secret number. Below are the correlations tables for a number
chosen (uniformly) at random out of 1-7.
P Even
1
456234
7
1
2
3
4
5
0
1
6
7
0
1
0
1
0
P*T Even A
0 mod 3
0
0
Odd
1
0
1
0
1
0
1
0
0
?
?
?
0
1
0
1
?
T
1
?
?
456734
0 mod 3
0
0
1
0
0
1
0
?
7
Even A
Odd A
Odd A
(0 mod 3) 0 mod 3 (0 mod 3)
0
1
0
0
1
0
0
?
(0 mod 3)
1
1
0
?
?
?
0
1
1
0
1
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