BreakRecMono1

BreakRecMono1 - Codebreaking using Statistics next Convex...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Codebreaking using Statistics next
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Convex Functions next
Background image of page 2
Convex Function Inequalities next
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
(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
Background image of page 4
A Special Case Useful in Cryptanalysis f(x) = log(1/x) next
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
A useful corollary Theorem Proof next
Background image of page 6
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
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 18

BreakRecMono1 - Codebreaking using Statistics next Convex...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online