Cipherday #50 · August 12, 2026

The answer to Cipherday #50

The full three-cipher chain from August 12, 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

“To finish first you must first finish.”— traditional racing adage

A reminder that completion comes before any medal.

The cipher chain

1. Stage 1 · Caesar · Shift of 13

   Ciphertext

   Xabjyrqtr vf cbjre.

   Decodes to

   Knowledge is power.

   Every letter was slid 13 places down the alphabet; sliding it back the same amount restores the line.

2. Stage 2 · Substitution · Keyword “FATHOM”

   Ciphertext

   Sl djnqlvo dr sl tcfkbo; sl ao noqmots dr sl tcfkbo lmsok.

   Decodes to

   To improve is to change; to be perfect is to change often.

   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 “CANDLE”

   Ciphertext

   Vo slymuh slcwv ybx xyut slcwv fvqtwj.

   Decodes to

   To finish first you must first finish.

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