Cipherday #79 · September 10, 2026
The answer to Cipherday #79
The full three-cipher chain from September 10, 2026, the public-domain quote it hid, and how each cipher worked. Today’s chain stays sealed until it becomes a past day.
The revealed quote
“That it will never come again is what makes life so sweet.”— Emily Dickinson (poem, 19th century)
Dickinson finding the sweetness precisely in the passing.
The cipher chain
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Stage 1 · Caesar · Shift of 4
Ciphertext
Jsvxyri erh pszi jezsv xli fvezi.Decodes to
Fortune and love favor the brave.Every letter was slid 4 places down the alphabet; sliding it back the same amount restores the line.
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Stage 2 · Substitution · Keyword “KEYSTONE”
Ciphertext
K airpt sbubsts knkbhpq bqptfo ykhhiq pqkhs.Decodes to
A house divided against itself cannot stand.A keyword scrambled the alphabet into a fixed cipher alphabet, so each letter always stands for the same partner — letter frequency gives it away.
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Stage 3 · Vigenère · Keyword “THUNDER”
Ciphertext
Moug lx nbsf ahzvk jizh extph vv ayta gnnij epzr vs jplyg.Decodes to
That it will never come again is what makes life so sweet.A repeating keyword shifted each letter by a different amount, which is what lets one letter encrypt two ways; the right keyword resolves it.