1. TRANSPOSITION CYPHER

2. Group Members: Abdul Basit Tahir Faizan Illahi Sundhu Kamran Ali
Noman Ahmad
Usman Ashraf

3. Transposition Cypher
Transposition cypher is a simple data encryption scheme in which plaintext
characters are shifted in some regular pattern to form a cypher text.

4. Keyless Schemes
Transposition cypher

5. Reverse Cypher
In reverse cypher, the whole plain text is reversed or each word of plain text is reversed to form cypher text.
Example: Reverse Plaintext
Plain text: H E L L O P A K I S T A N
Cypher text: N A T S I K A P O L L E W
Example: Reverse Words
Cypher text: O L L E H N A T S I K A P

6. Keyed Schemes
Transposition cypher

7. Rail Fence Cypher
The rail fence cipher is an easy to apply transposition cipher that jumbles up the order of the letters of a message in a quick convenient way. It also has the security of a key to make it a little bit harder to break.
 In the rail fence cipher, the plaintext is written downwards on successive "rails" of an imaginary fence, then moving up when we get to the bottom. The message is then read off in rows.

8. Encryption: Write diagonally, Read from row
Plain text: I AM A CYPHER TEXT
KEY : 3
Columns = Length of plain text = 14
Row = Key = 3
Cypher Text: I C E X A Y H R T M P

9. Encryption: Write in Row, Read diagonally
Cypher text: I E O R L V M C U T Y O Y N
KEY : 3
Columns = Length of plain text = 14
Row = Key = 3
Plain Text: I E O R L V M C U T Y N
I L O V E M Y C O U N T R Y

10. Pro’s & Con’s Easy to apply but….
It is not very secure specially for short messages.
Limited number of keys.
For enough transposition of letters, length of plain text needs to be at least
3 times of key

11. Route Cypher
The Route Cipher is a transposition cipher where the key is which route to follow when reading the cipher text from the block created with the plaintext. The plaintext is written in a grid, and then read off following the route chosen.
Key: It consists of route to follow and size of grid (either row or columns)

12. Encryption Plain Text: ABORT THE MISSION YOU HAVE BEEN SPOTTED Key:
Move inward counter-clockwise from top right
corner, with grid of 5 columns
Cypher Text:
TROBA TSYVN TEDXX TEANI MEHSO ESPOE
HOIUB A B O R T H E M I S N Y U V P D X

13. Decryption Plain Text: Cypher Text: ATSYV NTBHS OESEO EIUBP DRMOH
EOXTI NAETX
Key:
Move reading down the columns, with grid of 5 columns
Plain Text: A B O R T H E M I S N Y U V P D X

14. Pro’s & Con’s It is also very easy and quick scheme.
No limitations in selecting routs.
Only limitation is one’s imagination
But…
Sometimes, selecting inappropriate route ends up with parts of plain text (actual message) in right direction in cypher text.

15. Columnar Transposition Cypher
Columnar Transposition involves writing the plaintext out in rows, and then reading the cipher text off in columns. Columns reading order depends on key which is actually a keyword. We take the letters in the keyword in alphabetical order, and read down the columns in this order.
Key: It is a keyword of any length.

16. Encryption Plain Text: WE HAVE BEEN VICTORIOUS IN BATTLE Key:
A P P L E
Cypher Text: A 1 P 4 5 L 3 E 2 W H V B I C T O R U S N X A 1 P 4 5 L 3 E 2
WEVRI TVBOS TXAET UAXEB IINLH ECOBE

17. Decryption Cypher Text: TEENV AEYDI RTEAV NYXHM ACESN RAGFX Key:
E N E M Y
Plain Text: E 1 N 4 2 M 3 Y 5 T H A R D V C I G F S X A 1 P 4 5 L 3 E 2 E 1 N 4 2 M 3 Y 5
THE ENEMY ARE ADVANCING VERY FAST

18. Pro’s & Con’s The most secured transposition cypher scheme
Keyword is easy to easy remember then complex route
Its most important feature is that keywords can be applied more then once
First on plain text and then same or different keyword on cypher text

19. Myszkowski Transposition Cipher
The same methodology as for Columnar Transposition is used, where the plaintext is written out in rows under the keyword. The only difference is that when there are repeated letters in the keyword, rather than number them from left to right, we give all the same letters the same number. We then read across columns which have the same number in the keyword.
Key: It is a keyword of any length.

20. Encryption Plain Text: WE HAVE BEEN VICTORIOUS IN BATTLE Key:
A P P L E
Cypher Text: A 1 P 4 L 3 E 2 W H V B I C T O R U S N X A 1 P 4 L 3 E 2
WEVRI TVBOS TXAET UAXEH BEICI ONBLE

21. Decryption Cypher Text: TEEYE DNIVR ATEAV NYXHM ACESN RAGFX Key:
E N E M Y
Plain Text: E 1 N 3 M 2 Y 4 T H A R D V C I G F S X A 1 P 4 5 L 3 E 2 E 1 N 3 M 2 Y 4
THE ENEMY ARE ADVANCING VERY FAST

22. Pro’s & Con’s
It has all the advantages and disadvantages of columnar cypher.
Myszkowski has a plus point that is has no repetitive transposition