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Tables of Contents for Secret Codes
Chapter/Section Title
Page #
Page Count
Introduction
vi
Conceptual Overview
viii
Activity Overview
ix
Materials List
xii
Resources List
xiv
Additive Ciphers
1
16
Interest Link: Cryptic Terminology
6
1
Technology Link: The Alberti Enciphering Machine
7
1
History Link: The Spartan Scytale
8
1
The Caesar Cipher
9
1
Letter Frequencies
10
1
Me Caesar-You Decode
11
2
The Alberti Enciphering Machine
13
2
Machines at Work
15
2
Modular Arithmetic
17
24
Interest Link: Modular Arithmetic
25
2
Writing Link: Some More Ciphers
27
1
Numerical Enciphering
28
1
Mod Arithmetic
29
4
Multiplication Mod 7
33
2
Mod Arithmetic Revisited
35
2
Mod 4, 6, 8: What Do Spies Appreciate?
37
4
Multiplicative Shifts
41
16
Career Link: Cryptographic Technician
47
1
Writing Link: The Golden Bug
48
1
The Alberti Machine Revisited
49
1
Mod Multiplication on a Calculator
50
1
Multiplicative Shifts
51
3
More About Multiplicative Shifts
54
3
Prime Numbers
57
14
Career Link: Elizebeth Friedman
62
1
Prime Time
63
3
Primes Unlimited
66
3
Prime Sieve
69
2
Affine Ciphers
71
18
History Link: The War of Cryptographers
77
1
Writing Link: A Cryptic History
78
1
A Fine Cipher This Is
79
1
A Fine Decipher System
80
7
Affine Ciphers
87
2
Vigenere Ciphers
89
18
Technology Link: The Unbreakable Code
95
2
Technology Link: The Unbreakable Code-Broken
97
1
The Vigenere Cipher
98
3
The Kasiski Method
101
4
Using the Vigenere Cipher
105
2
Family Activity. Worms and One-Time Pads
107
13
History Link: One-Time Pads
111
1
Interest Link: Steganography
112
1
The Caesar Cipher
113
1
The Vigenere Cipher
114
2
Very Long Keywords
116
2
The Vernam Cipher
118
2
Completed Student Sheets
120