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Plaintext mis sis sip pik
CiphertextBQT SEI AEP YFC
Hill Cipher
m11 0 3 13 23 B9 22 0 18 i 19 Q mod26
s T6 7 11 12 24
Subtract Consecutive Numbers
1 12 2
1 12 2
1 12 2
30 1024 5 20 19s at
17 1628 3 27 4y wa
22 21 28 3ya
Ciphertext
19 27 2 39 2 3 6 8 10 11 20
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26
a b c d e f g h i j k l m
n o p q r s t u v w x y z
Lester Hill’s Cipher
Is a true block cipher. Blends two messages together.
Can encipher a true and false message and, if forced to reveal “the message,” choose to reveal the false message.
Comparison
Jack Levine’s Cipher