Computer Network Security

This problem deals with the concepts of confusion and diffusion

a. Define the terms confusion and diffusion as used in cryptography.

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b. Which classic cipher discussed in this chapter employs only confusion?

c. Which classic cipher discussed in this chapter employs only diffusion? d. Which cipher discussed in this chapter employs both confusion and diffusion?

Decrypt the following message that was encrypted using a simple substitution cipher:

GBSXUCGSZQGKGSQPKQKGLSKASPCGBGBKGUKGCEUKUZKGGBSQEICA CGKGCEUERWKLKUPKQQGCIICUAEUVSHqKGCEUPCGBCGQOEVSHUNSU GKUZCGQSNLSHEHIEEDCUOGEPKHZGBSNKCUGSUKUASERLSKASCUGB SLKACRCACUZSSZEUSBEXHKRGSHWKLKUSQSKCHQTXKZHEUQBKZAEN NSUASZFENFCUOCUEKBXGBSWKLKUSQSKNFKQQKZEHGEGBSXUCGSZQ GKGSQKUZBCQAEIISKOXSZSICVSHSZGEGBSQSAHSGKHMERQGKGSKR EHNKIHSLIMGEKHSASUGKNSHCAKUNSQQKOSPBCISGBCqHSLIMQGKG SZGBKGCGQSSNSZXQSISQQGEAEUGCUXSGBSSJCqGCUOZCLIENKGCA USOEGCKGCEUqCGAEUGKCUSZUEGBHSKGEHBCUGERPKHEHKHNSZKGGKAD

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