BreakRecMono1

# BreakRecMono1 - Codebreaking using Statistics next Convex...

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Codebreaking using Statistics next

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Convex Functions next
Convex Function Inequalities next

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(x , y ) G G f(x ) G (x , ) G x G x 1 x 2 x 3 x 4 x 5 f(x ) < y G G PROOF next
A Special Case Useful in Cryptanalysis f(x) = log(1/x) next

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A useful corollary Theorem Proof next
RECTANGULAR TRANSPOSITION THE BABOONS ARE COMING FOR YOU T B A M O 3 H O R I R 5 E O E N Y 1 B N C G O 4 A S O F U 2 H O R I R 5 E O E N Y 1 B N C G O 4 A S O F U 2 T B A M O 3 eat bho sbn oeo acr nfm giy uoo r next break it up into 3-gramms to hide the period (ROW VERSION) EATBH OSBNO EOACR NFMGI YUOOR RECALL THE ORIGINAL VERSION next

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Breaking Rectangular transposition The basic Ideas 1. Single letter frequencies are useless here 2. Not all pairs of adjacent english letters are equally probable 3. Thus a statistic based on a table of biletter frequencies should reveal which pairs of letters of ciphertext were adjacent in the plaintext! T
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## This note was uploaded on 09/22/2010 for the course MATH MATH187 taught by Professor Math187 during the Spring '10 term at UCSD.

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BreakRecMono1 - Codebreaking using Statistics next Convex...

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