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4. Suppose you want to add some punctuation to the alphabet and set . = 26, , = 27,! = 28, ? = 29. You are now using an affine cipher x > ax + B (mod 30) for the encryption. (a) Determine the number of possible keys. (b) Find the decryption key (the formula for decryption, do not make an explicit list of which alphabet maps to what) for a = 7 and ß = 9.

4. Suppose you want to add some punctuation to the alphabet and set . = 26, , = 27,! = 28, ? = 29. You are now using an affine cipher x > ax + B (mod 30) for the encryption. (a) Determine the number of possible keys. (b) Find the decryption key (the formula for decryption, do not make an explicit list of which alphabet maps to what) for a = 7 and ß = 9.

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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4. Suppose you want to add some punctuation to the alphabet and set . = 26, , = 27,! = 28, ? = 29. You are now using an affine cipher x > ax + B (mod 30) for the encryption. (a) Determine the number of possible keys. (b) Find the decryption key (the formula for decryption, do not make an explicit list of which alphabet maps to what) for a = 7 and ß = 9.
Transcribed Image Text:4. Suppose you want to add some punctuation to the alphabet and set . = 26, , = 27,! = 28, ? = 29. You are now using an affine cipher x > ax + B (mod 30) for the encryption. (a) Determine the number of possible keys. (b) Find the decryption key (the formula for decryption, do not make an explicit list of which alphabet maps to what) for a = 7 and ß = 9.
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