Figure 2.10 shows ciphertext coset signatures for various numbers of cosets. What is the likely keyword length? Explain.

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2. Find the sample signatures for the following two ciphertexts and com-
1. Figure 2.10 shows ciphertext coset signmatures for various numbers of
che scrawl 8f eacii
EXERCISES
cosets. What is the likely keyword length? Explain.
assumed keyword length = 2
assumed keyword length = 1
0.14
0.12
0.12
0.1
0.1
0.08
0.08
0.06
0.06
0.04
0.04
0.02
0.02
10
15
20
25
5
10
15
20
25
assumed keyword length = 3
assumed keyword length = 4
0.12
0.15
0.1
0.125
0.08
0.1
0.06
0.075
0.04
0.05
0.02
0.025
5
10
15
20
25
5.
10
15
20
25
assumed keyword length = 5
0.175
assumed keyword length = 6
0.15
0.15
0.125
0.125
0.1
0.1
0.075
0.075
0.05
0.05
0.025
0.025
10
15
20
25
5.
10 15
20
25
Figure 2.10 Figures for Exercise 1.
pare them with the signature of English.
Transcribed Image Text:2. Find the sample signatures for the following two ciphertexts and com- 1. Figure 2.10 shows ciphertext coset signmatures for various numbers of che scrawl 8f eacii EXERCISES cosets. What is the likely keyword length? Explain. assumed keyword length = 2 assumed keyword length = 1 0.14 0.12 0.12 0.1 0.1 0.08 0.08 0.06 0.06 0.04 0.04 0.02 0.02 10 15 20 25 5 10 15 20 25 assumed keyword length = 3 assumed keyword length = 4 0.12 0.15 0.1 0.125 0.08 0.1 0.06 0.075 0.04 0.05 0.02 0.025 5 10 15 20 25 5. 10 15 20 25 assumed keyword length = 5 0.175 assumed keyword length = 6 0.15 0.15 0.125 0.125 0.1 0.1 0.075 0.075 0.05 0.05 0.025 0.025 10 15 20 25 5. 10 15 20 25 Figure 2.10 Figures for Exercise 1. pare them with the signature of English.
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