Cryptography Reference
In-Depth Information
Appendix G: Exercises
We do not see things as they are, but as we are.
— from The Talmud, compilations of Jewish civil ceremonial law, dating
from the fifth century AD.
G.1 Chapter 1 Exercises
In Exercises 1.1-1.4, use Table 1.2 for the Caesar cipher on page 11 to
decrypt the ciphertext given in each.
1.1.
ZH EHJLO RXV MRXUQB
.
1.2.
RQ WKH LVODQG RI FUHWH
.
1.3.
ZLWK WKH PLQRDQ FLYLOLCDWLRQ
.
1.4.
D WUXOB PDJQLILFHQW SHRSOH
.
In Exercises 1.5-1.8, use Table 1.3 on page 11 to decrypt the numeric ci-
phertext given in each.
1.5.
20
,
18
,
4
,
12
,
14
,
3
,
20
,
11
,
0
,
17
,
0
,
17
,
8
,
19
,
7
,
12
,
4
,
19
,
8
,
2
.
1.6.
11
,
8
,
13
,
4
,
0
,
17
,
0
,
17
,
0
,
8
,
18
,
0
,
12
,
24
,
18
,
19
,
4
,
17
,
24
.
1.7.
4
,
0
,
18
,
19
,
4
,
17
,
8
,
18
,
11
,
0
,
13
,
3
,
8
,
18
,
17
,
8
,
2
,
7
,
8
,
13
,
7
,
8
,
18
,
19
,
14
,
17
,
24
.
1.8.
3
,
4
,
2
,
8
,
15
,
7
,
4
,
17
,
19
,
7
,
4
,
15
,
7
,
0
,
8
,
18
,
19
,
14
,
18
,
3
,
8
,
18
,
10
.
In Exercises 1.9-1.12, use the Polybius square 1.1 on page 10 to decrypt the
numeric ciphertext given in each.
1.9.
3534315412244543 521143 1123151114 3421 232443 44243215
.
1.10.
253334132543 4215353111131514 44344213231543
.
1.11.
44454233243322 142422244443 24334434 433445331443
.
1.12.
33345224442443
11
1211432443
3421
32113354
13243523154243
.
1.13. Using the permutation cipher displayed on page 9 decrypt the following
ciphertext:
IPEROTEWMURDS
.
(
Hint: See the discussion concerning the finding of inverse permutations
on page 122.
)
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