Experiment #10
Method of reversing the transposition:  Spiral-into the 9×10 grid, a route transposition.
Transposed text:

OBUOXOGHULFKEUVDKR
ACKEUAUHUKTDKSLB
SOLIFBBWGSLNGGIDCJT
XZTIZWRVQQPRNSKBWK
PFZMAZTQSJQJFNIWWAT

Playfair cipher: no keyword, kryptos, hydra, lhydra, medusa

MDTPYNFGQPKIZPYAGU
EBEZQESKPEOYHUMA
TNOFGAWRHRPMGGDYDHS
YYUKYRMQLULSMUHWRE
KKVLBYUURFTHKOHWWDQ

then

CAIKUBFGVIDYDVUETK
SBRDWOZDIUKHRONS
OCIQGAAXEBIMGGDOOQP
ZQZQUVYZLNTPLORAXT
YHWFYQZLCQNMDMQWWCY

then

IHOIUSBAWICMBWWYMY
YGLCZHOUVIQAMPIE
QTKNEGEUFTKMGGLHBKS
ZTNNUXDWPPOAMPMEUC
KGXNRTNPQLOMBMNWWZN

then

PAOGUSILOUCNAXXHNY
FBMCOLVLWGSRMQHA
QTHGEACVMORGGGMHBKS
ZTNNVZYWPPOZFQMCVI
QRTGETNPQKPNBMGWWFO

then

PAMRVQANYFCLMDXMLQ
GBIDMFMLDLQSNDIF
MTKHCAEPSZKLGGKEBKQ
ZTNNWYPXOPOTLDNEPI
QGYVMTNTDKPLBLHWWGO

Bifid cipher: no keyword, kryptos, hydra, lhydra, medusa

NSBGRWMTVOLSGIIOUX
PEIDGYEZUWYBEQIV
TFCEDMHXDXRZABUWGPS
ZGVUUCRFVUPODDFTNM
TOAGTGACHBIZGKGQLOD

then

BPANWPBKWISTGIDZZP
QCDHPKHCZYUSHRPT
PCOGOVPPESUKSGZYDUU
PYYTZGYRYCCICBQSSB
KNCNKFFBNBIZFHMSAIC

then

QACAVAQHUQPYEURAZR
NNFTLBGNZDUFAKME
RQRVBFLGFMWYYUZDDYX
YKFTZDMIGTTMNFDSSQ
HMLLHCSEAEHZLGWOTMN

then

QRCAWLQHUSPYKHDFZD
RREZKIFTZYUFRPMK
DWEHANKNESWYBHZYYCX
HINTZYSIGTTDRECSSQ
HDYKBBZCFCBZKNYPODR

then

QSBGETQEVKPDCWLSSQ
NTFTKISGSPYUSHLK
RQFEFLKNMGDQBESPKDU
PILTZMHIHSZLTFCMZQ
ELQKBBRCGCBZBGWEVLT

Four-square cipher: no keywords, kryptos-kryptos, kryptos-hydra, kryptos-medusa, hydra-medusa

M D T P Y N H G Q P K F E U Y A G U C A K E Q E S K U K T D
H U M A T N O F G A B W H R N L G G I D D H S Y Y U K Y W R
V Q U L S M U H B W K P K V L B Y U S Q F T F I O H W W D Q

then

I F V F V I P O W Q L C L W V M B A K H B L X F Z L V A A P
B F T G F G Q R O H H Y M I T R O O Q L F U D Z Z E U V W C
Z R T E D R F B H Y D A P X S H Z E R K U Q S L Q T X X K C

then

F F V Q V T L D X L M N L W X B D A G H C F Z A V A W L C E
D Q Q G F R Q M L H H Y O T U M P I S A F P D Z Z U U V Y C
X R R U E M G M H Y B Q P X U C Z U T U S Q T F Q O X X K S

then

G F V Q V T L O Y L N N O B X B D Q H H B A V F V L X L C E
E A R G F R R M M H G Y P D U M P I S A G P C Z Z U U V Y S
X R R U E M H M G Y B Q P X Q H Z U U E S Q T F R O W X K S

then

R F V Q V T F P Y L H O I C X B O R C K M B V F V L X L S E
P B M H Q T M N G I G V K E P N K K N A G M S Z Z U P V Y S
X R R S E O S O G V M R K Y L I Z U U C N Q O F M P W X E U

In this case, the cake is not a lie.

–Kryptosfan