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2.26 We describe a special case of a Permutation Cipher. Let m, n be positive in- tegers. Write out the plaintext, by rows, in m x n rectangles. Then form the ciphertext by taking the columns of these rectangles. For example, if m = 3, n = 4, then we would encrypt the plaintext "cryptography" by forming the following rectangle: cryp togr aphy The ciphertext would be "CTAROPYGHPRY." (a) Describe how Bob would decrypt a ciphertext string (given values for m and n).

2.26 We describe a special case of a Permutation Cipher. Let m, n be positive in- tegers. Write out the plaintext, by rows, in m x n rectangles. Then form the ciphertext by taking the columns of these rectangles. For example, if m = 3, n = 4, then we would encrypt the plaintext "cryptography" by forming the following rectangle: cryp togr aphy The ciphertext would be "CTAROPYGHPRY." (a) Describe how Bob would decrypt a ciphertext string (given values for m and n).

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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(b) Decrypt the following ciphertext, which was obtained by using this method of encryption: MYAMRARUYIQTENCTORAHROYWDSOYEOUARRGDERNOGW
Transcribed Image Text:(b) Decrypt the following ciphertext, which was obtained by using this method of encryption: MYAMRARUYIQTENCTORAHROYWDSOYEOUARRGDERNOGW
2.26 We describe a special case of a Permutation Cipher. Let m, n be positive in- tegers. Write out the plaintext, by rows, in m × n rectangles. Then form the ciphertext by taking the columns of these rectangles. For example, if m = 3, n = 4, then we would encrypt the plaintext "cryptography" by forming the following rectangle: cryp togr aphy The ciphertext would be "CTAROPYGHPRY." (a) Describe how Bob would decrypt a ciphertext string (given values for m and n).
Transcribed Image Text:2.26 We describe a special case of a Permutation Cipher. Let m, n be positive in- tegers. Write out the plaintext, by rows, in m × n rectangles. Then form the ciphertext by taking the columns of these rectangles. For example, if m = 3, n = 4, then we would encrypt the plaintext "cryptography" by forming the following rectangle: cryp togr aphy The ciphertext would be "CTAROPYGHPRY." (a) Describe how Bob would decrypt a ciphertext string (given values for m and n).
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