Dr. George Lasry

Externer Doktorand (Israel)
Raum
E-Mail-Adresse george.lasry@gmail.com
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Research Interests

My research is about modern cryptanalysis (codebreaking) of historical ciphers and codes. I focus on the application of local search metaheuristics (e.g. hill climbing, simulated annealing) to hard classical cipher problems. As part of the research for my thesis, I developed a new methodology to turn such metaheuristics into highly effective tools to solve challenging cipher problems, some of which could not be tackled before. Also successfully applied the methodology to solve the Double Transposition Challenge, the Hagelin M-209 crypto challenge, a public Enigma challenge, as well as the last Chaocipher challenge exhibit (Exhibit 6). In addition, new algorithms based on this methodology have enabled the decryption of hundred of original WW I German messages enciphered using the ADFGVX cipher (more details in the references below).

I am constantly engaged in trying to push the limits for the cryptanalysis of complex machines such as the SIGABA, the Lorenz SZ42 ("Tunny"), the Siemens and Halske T52 ("Sturgeon") and the Hagelin CX-52. I am also currently working on a project to decipher a large collection of German diplomatic and Navy messages from 1914, that were encoded using code books. In addition, I am active (currently #1 solver) at www.mysterytwisterc3.org, the leading crypto-challenge website.

Looking forward to cooperating on interesting projects such as deciphering historical messages, solving crypto challenges, and developing innovative cryptanalytic methods for additional historical cipher systems and machines.


Talks

  • Deciphering WWI ADFGVX Messages. The NSA Cryptologic History Symposium, October 2017, Johns Hopkins University, USA
  • Cryptanalysis of the Hagelin M-209. The NSA Cryptologic History Symposium, October 2017, Johns Hopkins University, USA
  • Cryptanalysis of the Hagelin M-209. The 3rd Historical Ciphers Colloquium, May 2017, Smolnice, Slovakia
  • Deciphering ADFGVX messages from the Eastern Front of WW I. The 2nd Historical Ciphers Colloquium, May 2016, University of Kassel, Germany
  • The Top 10 Historical Cipher Open Problems. The 2nd Historical Ciphers Colloquium, May 2016, University of Kassel, Germany
  • Cracking Unsolved Historical Ciphers and Challenges. The NSA Cryptologic History Symposium, 22. Oktober 2015, Johns Hopkins Universität in Maryland, USA
  • Cracking Unsolved Historical Ciphers and Challenges. Research Talk, 1. Oktober 2015, University of Kassel, Germany


02.03.2018

Publications

  • Lasry, G.: A Methodology for the Cryptanalysis of Classical Ciphers with Search Metaheuristics, Kassel University Press. kassel university press (2018).
     
  • Lasry, G., Kopal, N., Wacker, A.: Ciphertext-Only Cryptanalysis of Short Hagelin M-209 Ciphertexts. Cryptologia. (2018).
     
  • Lasry, G., Rubin, M., Kopal, N., Wacker, A.: Cryptanalysis of Chaocipher and Solution of Exhibit 6. Cryptologia. 1-28 (2016).
     
  • Lasry, G., Niebel, I., Kopal, N., Wacker, A.: Deciphering ADFGVX Messages from World War I Eastern Front. Cryptologia. 1-36 (2016).
     
  • Lasry, G., Kopal, N., Wacker, A.: Cryptanalysis of the Columnar Transposition Cipher with Long Keys. Cryptologia. 1-25 (2016).
     
  • Lasry, G., Kopal, N.I., Wacker, A.: Ciphertext-Only Cryptanalysis of Hagelin M-209 Pins and Lugs. Cryptologia. 1-36 (2015).
     
  • Lasry, G., Kopal, N., Wacker, A.: Automated Known-Plaintext Cryptanalysis of Short Hagelin M-209 Messages. Cryptologia. 1-21 (2015).
     
  • Lasry, G., Kopal, N., Wacker, A.: Solving the Double Transposition Challenge with a Divide and Conquer Approach. Cryptologia. 38, 197-214 (2014).