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Csec 630 Lab 1

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Q1. Which tool or technique from the above list would be most effective for a cryptanalyst to use to decipher a text encrypted with the Caesar cipher, and why?

The Histogram tool is the tool that will be most effective because it basically performs statistical analysis on the cipher text which basically shows the frequency at which each letter is used in a file or within the file. It can then be used for comparison and matching the frequency of the letters in the English language (Diffie,1996).

Q2. What do you notice about the histogram results when text is encrypted with the
Vigenère cipher in comparison to the results of the Caesar cipher? Why is this the case? The Caesar cipher was a lot easier to see the patterns of the alphabet. The frequency definitely made it easier to distinguish the usage pattern which makes it easier for decryption while the pattern is lost if it is viewed with the Vigenère. It will be easier to crack if the Caesar cipher is used compared to using the Vigenère which seems to be more difficult to crack.

Q3. 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” encipher option, the plaintext and key provided in the lab information, and DESELECTING the “separate duplicate letters only within pairs” option)

SDAHFOWGRABSSRERIVBYBSCIMQTFNIVETGHBSNQCNCSDTDHBSNQCD
ECNICIFCTIC

Answer:

The error that is included in the cipher text is written below in Blue:
THE DIFXFERENCE BETWEXEN STUPIDITY AND GENIUS IS THAT GENIUS HAS ITS LISCTS

The correct ciphertext is: The difference between stupidity and genius is that genius has its limits.

Q4. Of the three ciphers discussed (Caesar, Vigenère, Playfair), what are their relative degree of

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