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(a) Briefly explain the following security goals provided by cryptography: confidentiality, authentication, integrity and non-repudiation.
(b) State Kerckhoff's Principle and explain how it relates to cryptanalysis.
(c) Describe the chosen cipher text attack on encrypted messages.
(d) You have intercepted a message encrypted with a Caesar cipher. The ciphertext starts with HWDUYFSFQDXNX and you know the plaintext starts with c. Find the key and decrypt the message.
(e) Use Euclidean's algorithm to calculate gcd(763, 1729).
Five years ago, Calgary Kids' Cloth Ltd was just a small retail store in downtown Calgary. The company started their own factory in SE Calgary to produce outdoor clothes for kids.
Problem (a) As a forensic investigator, you are needed to trace the source of an email. It is suspected that the email header has been forged. Show how you would proceed to
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