Implementing-cryptography-using-python

Index ■ D–D 279
CIA Triad, 35–36
cipher block chaining message
authentication code (CBC-MAC), 206–207
Cipher Block Chaining (now CBC mode),
159–160
Cipher Feedback mode (CFB), 160–162
cipher space, use of term, 49
ciphers
Affine cipher, 90–93
ARC4 (ARCFOUR), 147–148
Atbash cipher, 77
block ciphers, 156–169
Caesar cipher, 74–76
ChaCha cipher, 151–156
column transposition, 87–90
Hill 2x2, 83–87
historical ones, 72–93
Playfair, 79–82
ROT-13, 76
Salsa20 cipher, 149–151
stream ciphers, 141–156
substitution ones, 73–77
Vernam cipher, 148–149
Vignère cipher, 77–79, 129–137
ciphertext (C)C, 2
Ciphertext Only (COA), 49
classical cryptography
data obfuscation (DO), 69–72
historical ciphers, 72–93
password best practices, 66–69
client
creating one for constructing plaintext
communications application, 250–251
modifying of for implementing PKI in
application using RSA certificates, 257
client file, modifying of in implementing
Diffie-Hellman key exchange, 264–266
client socket, creating, 213–214
clock synchronization, 42
closure (as group axiom), 106
Cocks, Clifford (mathematician and
cryptographer), 224–226
codes
commenting on, 10
message authentication codes, 60
collision resistance, 59
column transposition, 87–90
comments, on code, 10
“Communication Theory and Secrecy
Systems” (Shannon), 50
comparison operators, 13
Composer, Pip as similar to, 5
concatenate message and MAC, for
incorporating message hashing, 200
conditionals, use of, 16–17
continue loop, 18
count() method, 25
CPA (Chosen-Plaintext), 50
cryptanalysis
defined, 47
with Python, 123–137
understanding of, 47–49
cryptographic family, 33–34
cryptographic library, configuring your first,
47
cryptographic one-way hashes, 59–60
cryptographic protocols, 32–33, 46–47. See
also specific protocols
cryptographically secure pseudorandom
number generator (CSPRNG), 115,
141–144, 146
cryptography
history of, 31, 242
origin of term, 32
study of, 32–49
understanding of, 32–47
Cryptography library, 174–175, 189
Cryptography package, installing, 7–8
Cryptosteganography library, 175
cryptosteganography module, 175, 188,
189, 192
CTR (counter) style, 157
CTR mode (Integer Counter mode or
Segmented Integer Counter mode),
162–164
custom functions, 26–27
D
data
binary data, 71
obfuscating of, 69–72
data obfuscation (DO), 69–72
data origin authentication, 34–35
De Cannière, Christophe, 145
De Vita Caesarum, Divus Iulis ("The Lives of
the Caesars, the Deified Julius"
commonly known as The Twelve
Caesars), 74–76
DEC algorithm, 2
decode() method, 71
decoding, 71
decryption
Authenticate Then Decrypt, 211
constructing BLOB decryption with RSA
certificates, 232–235
constructing simple text decryption with
RSA certificates, 231–232
of files using AES, 169
def keyword, 26
DES, 36, 156
deterministic algorithm, 101
dictionaries, 25–26