Solution to Puzzle 4

If you haven't looked at the puzzle yet, you might like to do so before continuing.

The solution should speak for itself.

OKAYP EOPLE TIMEF ORSOM EREAL SECRE TMESS AGEST
HISON EWASA VIGEN ERETO PROCE EDYOU SHOUL DHAVE
TAKEN EVERY FIFTH LETTE ROFTH ECIPH ERTEX TITOL
DYOUT HATTH EKEYW ASFIV ELETT ERSLO NGYOU WOULD
HAVET HENDO NEAFR EQUEN CYCOU NTINO RDERT OESTA
BLISH HOWMU CHEVE RYFIF THLET TERHA DBEEN CAESA
RSHIF TEDYO UWOUL DHAVE THENU NSHIF TEDTH ELETT
ERSAN DRECO NSTRU CTEDT HEMES SAGET HEKEY BYTHE
WAYWA SBUFF Y

Okay, people, time for some real secret messages. This one was a vigenere. To proceed you should have taken every fifth letter of the ciphertext (I told you that the key w

as five letters long). You would have then done a frequency count in order to establish how much every fifth letter had been caesar shifted. You would have then unshifted the letters and reconstructed the message. The key, by the way, was BUFFY.

I've posted on Joss Whedon's show, Firefly, on this site.