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66. In Caesar Cipher, what is the plaintext corresponding to the ciphertext "QXPEHU"?
THEORY
MMATHS
NUMBER
CRYPTO
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67. Number of elements in the key space of the Substitution Cipher is
26!
26
262
226
68. Number of possible keywords of length m in a Vigenere Cipher is ____
26m
69. In Permutation Cipher, when the permutation is applied to "shesellsseas", we obtain
eeslshsalses
seseeslshsal
salseseeslsh
lshsalsesees
70. In Vigenere Cipher when plaintext is "THISCRYPTOSYSTEMISNOTSECURE" and key k = (2, 8, 15, 7, 4 ,17) the corresponding ciphertext is
WIZITWZTVPXZGIAXIVWPUBTTMJP
TWZTVPXZGIAXIVWPUBTTMJPWIZI
VPXZGIAXIVWPUBTTMJPWIZITWZT
TMJPWIZITWZTVPXZGIAXIVWPUBT
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