The document describes the use of poem codes during World War II by Britain's Special Operations Executive to communicate secretly with agents. It explains the encryption process involving a pre-arranged poem and how to encode and decode messages using Morse code. The example provided illustrates these procedures using the poem 'Jabberwocky'.

1. THE SOE CODE / POEM CODE
PRESENTED BY
* SAZZAD SAJU *

2. 1. INTRODUCTION (1/1)
• During the second world war, Britain’s special operations
executive (SOE) communicated with agents behind
enemy lines using codes based on poems which is also
known as poem code.
• Sender and Receiver pre-arranges a poem to use.
• Not case-sensitive as codes were send out using Morse
code.
In the next session, we’ll figure out the encryption and
decryption procedure of the poem code:-
2

3. 2. ENCRYPTION AT THE SENDER (1/6)
3
Let’s assume sender-receiver both
agree upon the Jabberwocky Poem

4. 2. ENCRYPTION AT THE SENDER (2/6)
1) For our key, we randomly pick from poem:
• the, all, mome, gyre, twas
2) Indicator group:
• DNUHA
• (the-> 4th word -> 4 gives-> D)
• (all-> 14th word -> 14 gives -> N)
• And so on…. 4

5. 2. ENCRYPTION AT THE SENDER (3/6)
3) Numbering:
5
Finally,
T H E A L L M O M E G Y R E T W A S
15 7 3 1 8 9 10 12 11 4 6 18 13 5 16 17 2 14

6. 2. ENCRYPTION AT THE SENDER (4/6)
6

7. 2. ENCRYPTION AT THE SENDER (5/6)
7

8. 2. ENCRYPTION AT THE SENDER (6/6)
8) Add the indicator group with this, group into five, complete:
8
[Send out]
dnuha eesde tugym oacan nchis eoelx nsjmh
yiocn hdani etead cremh asvs

9. 3. DECRYPTION AT THE RECIPIENT (1/6)
WE GET: DNUHA EESDE TUGYM OACAN NCHIS EOELX NSJMH YIOCN
HDANI ETEAD CREMH ASVS
1) From group indicator generate the key:
• DNUHA -> 4 14 21 8 1
• From poem selected words:
• the, all, mome, gyre, twas
9

10. 3. DECRYPTION AT THE RECIPIENT (2/6)
2) Numbering: (same as before-
slide5)
10
T H E A L L M O M E G Y R E T W A S
15 7 3 1 8 9 10 12 11 4 6 18 13 5 16 17 2 14

11. 3. DECRYPTION AT THE RECIPIENT (3/6)
3) Fill Column with Cipher:
• Cipher: eesde tugym oacan nchis eoelx nsjmh yiocn hdani etead cremh asvs
• (Total column of key 18, elements in cipher = 54:: so row= 54/18 = 3)
• Cipher: ees det ugy moa can nch ise oel xns jmh yio cnh dan iet ead cre mha
svs
11
T H E A L L M O M E G Y R E T W A S
15 7 3 1 8 9 10 12 11 4 6 18 13 5 16 17 2 14
e i u e o x j c y m n s d c c m d i
a s g e e n m n i o c v a a r h e e
d e y s l s h h o a h s n n e a t t
[Fill
column1,
column2
and so
on..]

12. 3. DECRYPTION AT THE RECIPIENT (4/6)
4) Read row wise (row1, row 2 and so on):
12
T H E A L L M O M E G Y R E T W A S
15 7 3 1 8 9 10 12 11 4 6 18 13 5 16 17 2 14
e i u e o x j c y m n s d c c m d i
a s g e e n m n i o c v a a r h e e
d e y s l s h h o a h s n n e a t t
eiu eox jcy mns dcc mdi asg een mni ocv aar
hee dey sls hho ahs nne att
Row Wise (row1, row2 so
on):
[Table
from step
3]

13. 3. DECRYPTION AT THE RECIPIENT (5/6)
5) Fill column with cipher from step 4
• cipher: eiu eox jcy mns dcc mdi asg een mni ocv aar hee dey sls hho ahs nne
att
13
T H E A L L M O M E G Y R E T W A S
15 7 3 1 8 9 10 12 11 4 6 18 13 5 16 17 2 14
h a j e e m o h a m m a d d a n e s
h s c i e n c e a n d t e c h n o l
o g y u n i v e r s i t y c s e x s
6) Read row wise:
hajee mohammad danesh science and
technology university cse xs

14. 3. DECRYPTION AT THE RECIPIENT (6/6)
* Remove null characters i.e. ‘xs’
14
[Original Message]
HAJEE MOHAMMAD DANESH SCIENCE AND
TECHNOLOGY UNIVERSITY CSE

15. .▀█▀.█▄█.█▀█.█▄.█.█▄▀ █▄█.█▀█.█─█
─.█.─█▀█.█▀█.█.▀█.█▀▄ ─█.─█▄█.█▄█
15
Profile
Name: Sazzad Saju
CSE, Hajee Mohammad
Danesh Science and
Technology University,
Dinajpur, Bangladesh