Index (Z/nZ)∗, 306 n k ) , 307 ⊕, 137 d-regular, 204 k error detecting, 248 adjacency matrix, 205 adjacent, 173 Advanced Encryption Standard (AES), 158, 171 affine cipher, 32 AKS primality test, 308 alphabet, 247 ASCII, 135 attack ciphertext-only, 127 known-plaintext, 127 authenticity, 21 avatar, 278 BabyBlock cipher, 158 BabyCSS, 151 base, 315 base B expansions, 189 bigrams, 116 binary code, 247 binary expansion, 189 binary number system, 134 Binet’s formula, 74, 233 binomial coefficient, 58, 59, 307 binomial theorem, 199 birthday attacks, 235 birthday problem, 235 bit, 135, 279 Bletchley Park, 11 block cipher, 158 book code, 7 box principle, 224, 234 Caesar cipher, 22, 24 key, 25 Carmichael numbers, 201, 299 carrier, 270 ceiling, 189 chaff, 277 chaffing and winnowing, 277 check digit Verhoeff, 259 check digit, 258 Chinese Remainder Theorem, 237 Choctaw Indians, 8 cipher, 4 affine, 32 Caesar, 22, 24 key, 25 Hill, 39, 40 multiplication, 109 one-time pad, 122 running key, 120 stream, 138 substitution alphabet, 22 symmetric, 171 Vigen` ere, 34 ciphertext, 22, 24 ciphertext-only attack, 127 clock arithmetic, 27 clumping, 177, 178 code, 4, 240, 247 k error detecting, 248 binary, 247 exactly k error detecting, 249 fixed length, 247 Hamming (7, 4), 253 code talkers, 9 329
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