#87564
The-Letter-Wriggler
Participant

9B THE SOLVE
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factors of 1869 = 3, 7, 89.
3 x 7 = 21

Reverse the ciphertext and set to 89 rows of 21 letters.

Study the last row (#89) UHHYBOOADYROSMLRAUAWL
and transpose the letters so as to read YYOURSABRAHAMWOODHULL
while writing down the numbers of the swapped columns.

NOW DO FULL COLUMN TRANSPOSITIONS (Make a new plaintext 21 x 89 matrix)
(Move everything under ciphertext column 1 to Plaintext column 4,
then col 2 to col 10, 3 to 7, 4 to 1 etc.)
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 <= Ciphertext Columns
Move the above columns into the below columns
04 10 07 01 16 13 19 05 11 08 02 17 14 20 06 12 09 03 18 15 21 <= Plaintext Columns

EXAMPLE: TRANSPOSITION OF THE 21 COLUMNS OF THE LAST ROW
01_02_03_04_05_06_07_08_09_10_11_12_13_14_15_16_17_18_19_20_21__Column Reference
_U__H__H__Y__B__O__O__A__D__Y__R__O__S__M__L__R__A__U__A__W__L__a Ciphertext
_Y__Y__O__U__R__S__A__B__R__A__H__A__M__W__O__O__D__H__U__L__L__b Plaintext
04_11_18_01_05_15_03_10_17_02_09_16_06_13_19_05_12_20_07_14_21__Decrypt a to b

For Encryption (Not needed here)
04_10_07_01_16_13_19_05_11_08_02_17_14_20_06_12_09_03_18_15_21__Encrypt b to a

HERE IS THE REVERSED TEXT 21 X 89 SPACED FOR COPY-PASTE TO A SPREADSHEET
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S G T I H T I E A T R H I E W W R I T T I
A O U L O H H L C L C E E E P V S L T T E
C C F P U O R I S E N N M T C O A A M I I
Y T V L L P T I O I E R H A D W H E I S E
E E A X Y A R S N T U N E U M M F S L L I
A H O T O E S S P H N X T V E C A S I E D
O H N I M U T C I T U T O C A T S Y O R N
W D O D N A E E E W E K L O H I T T L M E
R N E R E H R E V A M A N S R A T W G I I
N T P T P H E R O T O E R N R A O E E T A
N L E T H I O O T I E N F P C O D R T O O
N P H D I I A L S E L T I S R D O O W T T
I N F L T R G E O Y H E E T H V A T N U E
T T U C S D N F C O O O N A E E H M T T N
I U S T S G W O E I E H L H L L R T U I E
C O T V E R L T P E R Y P N T I E I H C C
U W E I I B C N R R O E A L T L I S T L R
E C D I T A T E N C H A T R O D U T O I T
E O A H U N S C C O R I N M I I M T O U O
E N L N T O D E I S M W A W B P T L R H E
R H I C W I A T N H I G E E G G D N D S T
E M A H S E N E L E T P S O E W T C Y R I
E I L T S S H T A T S M E L R R L L I A I
U K M S H Y B N S K I A I N L T O A T L L
K E L R T E S H I I T W H O B T C L A D E
C B R D R C S D F I E I V M R O Y A E S A
E A H N L P H E R D L E C U P R G A O E S
E L U W A I W E O E R N E S C R E R C S H
E R F O O E C E I I V S F A H O N T C M E
K N N Y E T A O O M C I T E E E N B H C T
N E E W P D E P H E E T U A U C R C L N L
R N G P T Y R E I E H M N H T I T H G E B
L H Y E S U B E S A E R T W T E O S O O E
R O L M T T O F L W O A E E H K R T D S A
A N F T R F H A R I R O E E N V G I A D A
C H T L T U C T T A O L S V A E E O S A L
U E T L R T W S A O E H T I H S T S O T O
R N N U V I D A E L E D M E E E Y C O V O
E O S F U E H E Y T R S A T E N F T T H M
N S T E H E E Y T V E C F S E I U H T P W
N T N A C B I I E Y H E H A S W H U I S E
E B D D I E H L I T L V E N N R E E W O C
P I E E E L O T B T I D O O E R W L V U S
N I W S N N O D W C E E E I E C F H R K R
F I R E J F O D A T O R N C N I E A D I D
C U B H E R R G Y E A R L H T O E U L A W
S O H E A E O K W L C M T T N T F E R H T
S C G H P Y Y D N E E I O R E T A C P R L
O S L L I S H I B P T I E O T N P E S S H
H F D A A O T E E T V W Y L E E O M H L T
N T H O Y G A L I L A H L O V G H A E U E
N R M B Y L E A O E C T E F N V E O R U I
M O N T V N R R A O I T E M I Y N D N E N
C S Y A T R Y E T N H I S C E A E T E U A
T Q S M E T T D R A A E E A I H U W H R L
W G C L H T E N A B I R T O E A F K C R R
D A T S I S N S I A L M R N R T N H A A E
N R N M M L I O A A F E C A S S T D O B A
N H P F C C A I M E E O O V E D A L N E T
H K A E U I T E G D S N H E T E E T O P H
N R E E I R A L H B L N I T T K E R W U O
P H V C R I L T A U I H P N M E I E E K A
E R E N I O G P H A M N T S A D E R O S N
H E N D O E N L Y O L L R G F E A N C U R
T S R A I N K K E N S T E F E H O F R I R
F I E I H S G R D N E I R O E U C R T N D
W M A S T I O E C H H A N Y D I M R G C I
E C I N E I H F C T O N O N G H O N P V T
B T S H T S M A A E H W T H G O T A H I O
N E B V T I R P N E O O E A T M R U N T I
L R E W E T U E R O F O P O E D N V R T A
O L T L C N Y A I M I T F D T F I Y I E H
R A A E I K E S H R N T M I M E R T A S Y
I W M A I D T S E C E B I U N V O E T L T
E M R I T T N E E O H H B O E D T S Y O C
T I N U E S I C A R N B A S E Y E K G A R
E R C S E L H N R T I A A G N Y E O R U T
W F R A T R T E L C H A T D S I E E H E E
A O A R H N E T S V A I D G I N R T T A O
G Y C N A C I R E M R H T U S H O K C T I
N L P F I E Y F U M S D M G E A A P E G R
S T E H S T P E L A B O T E V I T A I R E
M M U M A A S D K S N N T F S I S N H R U
F T T R D W O N A E E H Y T V M I E I Y E
E V K R L H H E N T I I B I H Y E I E T A
A O C V E V M T N E D I A O T N C E G N H
F I S E S N O R S M E E H U F T O O E S T
R I E H U I I T C E A N I N E S O R T S L
U H H Y B O O A D Y R O S M L R A U A W L
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 Move-From
04 10 07 01 16 13 19 05 11 08 02 17 14 20 06 12 09 03 18 15 21 To-Here