Cryptanalysis of the Engima - 44CON 2012

Cryptanalysis of the Enigma

whoami

• Bob Weiss - @pwcrack - President and Founder, Password Crackers, Inc. (pwcrack.com) & Defcon Goon

• Benjamin Gatti - @BenjaminoG - Developer, OpenVPN

Alan Turing

Were Alan Turing alive today, he would be unconstrained by either the mechanical computing devices of the 1940's; or it's pharisaical provincialism.

We are pleased to present a digital Enigma attack in London at #44Con during this centennial of his birth.

Demo Time

Yeah we're starting the demo now!

Why do we care about The Enigma?

• Inflection Point in the history of cryptography

•Fascinating WWII narrative

There is no Enigma

•There are multiple versions•Army and Navy• 3 & 4 Wheel•Variable Reflector

How the Enigma works.

• Wheel Order (3 of 5 wheels for 60 options)

How the Enigma works.

• Ring settings (676 orr 262 options)

How the Enigma works.

• Message Settings (17,576 or 263 options)

How the Enigma works.

• Plugboard (150,738,274,937,250 or 150 trillion)

How the Enigma works.

•Expected complexity of Enigma 277

•DES 256

•AES 2128

Historic Cryptanalysis

• Polish Cipher Bureau - 1932, Marian Rejewski, Machine Characteristics

• Polish Bombe - 1938• Polish Setback - Dec. 1938 Germans add two

rotors• Polish Disclosure - 1939 Poles tell the French• Crib-Based Decryption - Turing• British Bombe - 1930• American Bombe - 1941

Programming Challenges

GPU – OpenCL Memory Database Throughput

Sorted Chi

Stecker Isolation

Letters for each Stecker Binned separately.

26!! - 6!! (150T) to 26^3 (17K) (pwned)

EDGYEMHENYFYEJOEIYKUFMKEUATHEFOXJUMPEDOVERTHELAZYDOG

TOUORD Chi(E Stecker)

Diagonal Conflation

Back to the Demo

Q & A

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