In a transposition cipher the encryption and decryption keys are often represented as two one-dimension tables (arrays)
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In a transposition cipher the encryption and decryption keys are often represented as two one-dimension tables (arrays) and the cipher is represented as a piece of software (a program).
a. Show the array for the encryption key in Figure 31.6 in the text.
b. Show the array for the decryption key in Figure 31.6 in the text.
Figure 31.6
c. Explain, given the encryption key, how we can find the decryption key.
Transcribed Image Text:
Alice Bob Plaintext Plaintext enemy attackstonightz enemy attackstonight z Write row by row Read row by row e e m y m y a a a k k h i h 3. 4 5 123 4 5 E E TA A T K E E M T Кey A A. S T. K H G Read column Write column by column by column ETTHEAKIMAOTYCNZNTSG ETTHEAK IMAOTYCNZNTSG Transmission Ciphertext Ciphertext Z N OT Decrypt Encrypt NZ
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