Sunday, December 30, 2018

cipher - A letter telling my great-great-grandfather's death-day


Yesterday, while I was tidying my attic, I found a letter dedicated to my great-great-grandfather. (Note that the letter was inside a box which my great-great-grandfather transmitted to my great-grandfather, and so on...) It is supposed to tell him his death-day. I actually know he got murdered, and I also know the exact date when it happened. Now I just want to know if this letter is actually accurate, but I can't decrypt/solve it. Can someone please help me? This is what it says (except the part about how he will be killed):


... (5.3-912-83-19-24) + (2.3-12-931-453-1) = mm


(119.9-12-32-183-873) + (300-200-193-930-39.2) = dd



(4.2-342-12-123-847) + (293-1-2-93-8.7) + (59-21-329-12-23-987) + (4.2-181-192-712-9995) = yyyy


Have fun decrypting it. Meanwhile I will wait. You should start learning how to make SOS-signs, because no-one will hear you.


P.S: Don't even think of solving it the "regular" way, like you've learned in school, you silly!



Answer



It was on



19 November 1901



because (short answer)




Morse code



or because (long answer)



Ignore the numbers in the puzzle; they're just a red herring. Concentrate instead on the dots and dashes between the numbers. We get:

mm = (.----)(.----) = 11
dd = (.----)(----.) = 19
yyyy = (.----)(----.)(-----)(.----) = 1901.



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