Transcript Topic: Simple Transposition Cipher

Transposition Cipher
Edilasio Pereira
Steven Pascal
Louis Szgalsky
Kimberly Chiffens
• 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.
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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
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Rail Fence
Ciphertext
• ITIAGOAIGTSHSSOSTES
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...Decrypted
• TIAGOAIGT
SHSSOSTES
• Message: IS THIS AS GOOD AS IT GETS
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Columnar Transposition
Message: THE GOLDEN RULE IS THAT
THERE ARE NO GOLDEN RULES
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Columnar Transposition (cont)
THEG
OLDE
NRUL
EIST
HATT
HERE
AREN
OGOL
DENR
ULES
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Columnar Transposition (cont)
TONEHHAODUHLRIAERGELEDUSTREON
EGELTTENLRS
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Columnar Transposition
Ciphertext
AEGLRADHNTAHSTTAETWYCEHOOCE
IKRBELMUSTVXY
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Columnar Decrypted
LARGE
ANDTH
ATSTH
EWAYT
HECOO
KIECR
UMBLE
STVXY
AND THATS THE WAY THE COOKIE
CRUMBLES
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