Is Zodiac’s unsolved cipher a hoax, or does it have a real message? Let’s investigate some possible clues, in Episode 2 of “Let’s Crack Zodiac”: https://www.youtube.com/watch?v=uyH9-AHz-HY
Nice video, Dave. 🙂
What are the bigram “scores” for the top half / bottom half vs their respective random shuffle average?
As I recall, there are a fair few recurring bigrams that appear in one half but not in the other half at all.
I have some details of the top vs bottom bigram bias here:
I measured the bias based on the spread between the top and bottom halves. “In 1,000,000 shuffles, only 2.4% of them had halves with a repeated bigram discrepancy as large as the one observed in the 340 (i.e., a difference of at least 8 repeated bigrams between the halves).”
As for the raw average per half, I would imagine they’d be half of the shuffle average for the whole cipher. Overall shuffle average was 20 so I’d guess each half would average around 10. Yet Z340 has 9 repeats in the top and only 1 in the bottom.
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