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-[Mean on Khan Academy](https://www.khanacademy.org/math/ap-statistics/summarizing-quantitative-data-ap/measuring-center-quantitative/v/mean-median-and-mode)
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@@ -61,13 +61,3 @@ Decryption is similar to encryption (except for the subtraction operation).
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-[Index of coincidence](https://en.wikipedia.org/wiki/Index_of_coincidence)
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3. Once the key length is found, [frequency analysis](https://en.wikipedia.org/wiki/Frequency_analysis) can be used to find the key and hence crack the cipher.
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4. Therefore, this cipher should not be used to encrypt any important data.
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