Delete comment from: Ken Shirriff's blog

BitShifter said...

Basically statistics helps you out. As long as the sub-texts are long enough to gather statistically significant samples, you can perform letter frequency analysis. If you select every 6th letter from an english text, e should still be the most common letter in the text. With punctuation, space may beat it.

I think this is roughly what he meant with the letters should repeat.

Feb 12, 2009, 12:07:00 PM

Posted to Simple Cryptanalysis with Arc