Network Security using JCrypTool

An Introduction to Cryptographic Techniques Network Security using JCrypTool

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LIST OF SEVEN LAB QUESTIONS
All lab questions are repeated here as a matter of convenience. Look for these questions in the
lab instructions as you complete the lab work:
Question 1. Which analysis component from the ones chosen were most effective for a
crytoanalysis to use to decipher a text encrypted with the Caesar cipher and why? [10 points]
Question 2. What did you notice about the Frequency Test results when the text is encrypted with
the Vigenere cipher in comparison to the results of the Caesar cipher? Why is this the case? [10
points]

An Introduction to Cryptographic Techniques Network Security using JCrypTool

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Question 3. There is an error in the following ciphertext representation of this quote, what is it?
What should the correct ciphertext be? (Hint: when using the Cryptool there are several ways to decode one that you can use is Playfair “Encrypt” option, the plaintext and key provided in the
lab information, and deselecting the ‘Separate pairs” options). [10 points]
Question 4. Of the three ciphers discussed (Caesar, Vigenere, Playfair), what are their relative
degree of security and why? [10 points]
Question 5. Which method provides a stronger encryption ECB or CBC? Why?[10 points]

An Introduction to Cryptographic Techniques Network Security using JCrypTool

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Question 6. For each of the following say whether ECB or CBC would be most appropriate and
give a brief explanation as to why.
a) An online bank statement [10 points]
b) An encrypted VoIP session [10 points]
c) Viewing of a website using TCP/IP [10 points]
Question 7. Analyze the data encrypted with the RSA cipher. How does this encryption method
compare to the other methods the Lab has covered? [10 points]
REPORT SUBMISSION
Submit a single document with all your responses to the ELEVEN questions including screenshots of your lab work in assignment folder for this lab.