I was starting something like this. But it doesn't seem to work out:

 crypt = <<-ENDC
  YRFFJ OSLXA PQPQY APVRR DPNSA ZAPIK
  OXMQJ BOIMY XMSZZ FRIHE AUXJS IOROR
  IEAHB QYAPQ YRHXJ STRIF ORIEX KOIKD
  REAQK JHBOI QSFIQ AJHPA QPKIF FREKO
  XMQJB OIGAA LRKIS PRNSA Z13VI PIKOX
  MQJBO IGNSA ZIPVR FFYJM RXJSY IEUSH
 ENDC

 ('A'[0]..'Z'[0]).each { |c| puts "#{c.chr} -> #{crypt.count(c.chr)}" }
 A -> 14 
 B -> 5
 C -> 0
 D -> 2
 E -> 6
 F -> 9
 G -> 2
 H -> 6
 I -> 18
 J -> 10
 K -> 8
 L -> 2
 M -> 6
 N -> 3
 O -> 12
 P -> 11
 Q -> 11
 R -> 15
 S -> 11
 T -> 1
 U -> 2
 V -> 3
 W -> 0
 X -> 9
 Y -> 7
 Z -> 5


 english = File.read('/usr/share/dict/words').upcase

('A'[0]..'Z'[0]).each { |c| puts "#{c.chr} ->#{english.count(c.chr)}" }
 A -> 64123 
 B -> 15524
 C -> 31569
 D -> 28877
 E -> 88441
 F -> 10551
 G -> 23073
 H -> 19313
 I -> 66892
 J -> 1915
 K -> 8456 
 L -> 40826
 M -> 22433
 N -> 57227
 O -> 48779
 P -> 21891
 Q -> 1510
 R -> 57035
 S -> 88135
 T -> 52446
 U -> 25927
 V -> 7903
 W -> 7431
 X -> 2124
 Y -> 12507
 Z -> 3238



On Tue, 2009-05-26 at 00:21 +0900, lith wrote:
> > 1.  Please do not post any solutions or spoiler discussion for this
> > quiz until 48 hours have elapsed from the time this message was
> > sent.
> 
> > YRFFJ OSLXA PQPQY APVRR DPNSA ZAPIK
> 
> Since 48 hours have passed, maybe somebody could at least explain what
> this quiz was about. Or maybe simply post a solution.
> 
> Cheers.