The document discusses transposition ciphers, which encrypt plaintext by rearranging its characters according to a defined system, creating a permutation of the original text. It includes examples like the rail fence and columnar transposition ciphers, demonstrating how messages are encoded and decoded. Through mathematical functions, positions of characters are altered for encryption and then reversed for decryption.

1. Transposition Cipher
Edilasio Pereira
Steven Pascal
Louis Szgalsky
Kimberly Chiffens

2. 09/27/10 copyright 2006 free
template from
2
• a transposition cipher is a method of
encryption by which the positions held by units
of plaintext (which are commonly characters or
groups of characters) are shifted according to a
regular system, so that the ciphertext constitutes
a permutation of the plaintext. That is, the order
of the units is changed. Mathematically a
bijective function is used on the characters'
positions to encrypt and an inverse function to
decrypt.

3. 09/27/10 copyright 2006 free
template from
3
The Rail Fence Cipher
• POETRY IS WHAT IS LOST IN
TRANSLATION
P E R I W A I L S I T A S A I N
O T Y S H T S O T N R N L T O

4. 09/27/10 copyright 2006 free
template from
4
Rail Fence
Ciphertext
• ITIAGOAIGTSHSSOSTES

5. 09/27/10 copyright 2006 free
template from
5
...Decrypted
• T I A G O A I G T
S H S S O S T E S
• Message: IS THIS AS GOOD AS IT GETS

6. 09/27/10 copyright 2006 free
template from
6
Columnar Transposition
Message: THE GOLDEN RULE IS THAT
THERE ARE NO GOLDEN RULES

7. 09/27/10 copyright 2006 free
template from
7
Columnar Transposition (cont)
THEG
OLDE
NRUL
EIST
HATT
HERE
AREN
OGOL
DENR
ULES

8. 09/27/10 copyright 2006 free
template from
8
Columnar Transposition (cont)
TONEHHAODUHLRIAERGELEDUSTREON
EGELTTENLRS

9. 09/27/10 copyright 2006 free
template from
9
Columnar Transposition
Ciphertext
AEGLRADHNTAHSTTAETWYCEHOOCE
IKRBELMUSTVXY

10. 09/27/10 copyright 2006 free
template from
10
Columnar Decrypted
LARGE
ANDTH
ATSTH
EWAYT
HECOO
KIECR
UMBLE
STVXY
AND THATS THE WAY THE COOKIE
CRUMBLES