Cipherday #70 · September 1, 2026

The answer to Cipherday #70

The full three-cipher chain from September 1, 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 which does not kill us makes us stronger.”— Friedrich Nietzsche (Twilight of the Idols, 1888)

A much-quoted line on hardship read as forging.

The cipher chain

1. Stage 1 · Caesar · Shift of 9

   Ciphertext

   Wnlnbbrch twxfb wx ujf.

   Decodes to

   Necessity knows no law.

   Every letter was slid 9 places down the alphabet; sliding it back the same amount restores the line.

2. Stage 2 · Substitution · Keyword “TELEGRAM”

   Ciphertext

   Hcsshr ey hcsshr, kjr wthfq atp.

   Decodes to

   Little by little, one walks far.

   A keyword scrambled the alphabet into a fixed cipher alphabet, so each letter always stands for the same partner — letter frequency gives it away.

3. Stage 3 · Vigenère · Keyword “HALCYON”

   Ciphertext

   Ahlv uvvjh oqcg avt vkjz hz mlmcg hz setmbtlr.

   Decodes to

   That which does not kill us makes us stronger.

   A repeating keyword shifted each letter by a different amount, which is what lets one letter encrypt two ways; the right keyword resolves it.