Example
Key 1: EEEE
Key 2: ERTY
What are the advantages of using key 2 over key 1 and why?
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Do you know how the cipher works? – Randall May 30 '19 at 03:03
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I have only learnt the basics of it so i'm sorry if this is a stupid question. – Ewen Seck May 30 '19 at 03:27
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Test out examples of plaintexts against each of these keys. What do you notice? – Randall May 30 '19 at 03:28
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Welcome to Mathematics Stack Exchange! A quick tour will enhance your experience. Here are helpful tips to write a good question and write a good answer. For equations, use MathJax. – dantopa May 30 '19 at 03:42
1 Answers
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If you used the key EEEE, the cipher would not be a Vigenère. It would degenerate into an extremely weak Caesar cipher. With the key ERTY, you would get a genuine Vigenère cipher of period 4. While this is still very weak, breaking it nevertheless does require a little more work than a Caesar cipher does.
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