SOLUTION to Challenge 5: A Vigenere Cipher

Congratulations to Euchre Mutt for solving Challenge 5 on September 22 at 8:06 UTC. This challenge remained unsolved for 25 days, which means Euchre gets 25 points! That jumps him to the top of the leaderboard!

I’ll reveal the secrets below, but if you haven’t tried your hand at solving it, read this first.

The solution is after the jump.

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Ciphertext:

EHAQWDPEZRRWAHTNELTNOHMJEIAWAJOYNOYHSYPKTGAWWDOJSNSICZYAJRTSETYHOKRIWOAAPDBFTRASTRHLZFHEHTWLBOQQOYESECFTZNOLETDSXFMPETMA

Plaintext (formatted):

“The cryptogram contains the explanation why two balls, one in iron and one in wood, dropped from a high place will fall on the ground at the same time.”

Keyword: LAWOFFALL

The plaintext is a itself a clue to a cryptogram made by Giovan Battista Bellaso, an Itallian cryptologist born in 1505. In the clue, he was describing the Law of Falling Bodies, beating Galileo to the punch by forty years! Bellaso’s cryptogram remains unsolved to this day.

Bellaso was the first to describe what we now call the Vigenère Cipher in his 1553 book La cifra del. Can you guess the identity of the person in the challenge image?

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