International Conference On Cryptologic History

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ICCH awarded a Golden Alice for Best Cryptographic History Event of 2020.
Search ICCH speakers, presentations & websites.

Welcome to the home page of the International Conference on Cryptologic History (ICCH).

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Upcoming Presentations

Here is a list of upcoming presentations at ICCH. The next presentation is shown at the top. Click on each listing to reveal more information below, including the speaker, as well as the presentation date and description.

To view past ICCH presentations, click here.

Note: Effort has been made to ensure that the information on each presentation is accurate and up-to-date. To suggest a correction please contact the ICCH webmaster Patrick Hayes at info@cryptologichistory.org.

Presentation:

Solving Historic Ciphers with Modern Means

Speaker(s):
Date & time (UTC/GMT):
October 3, 2021 5:00 PM
Description:

Many old encryption methods are still hard to break today. For instance, cryptanalyzing a short 19th century Playfair cipher is far from trivial. WW2 Enigma messages, spy ciphers from the Cold War, and manual methods used by criminals such as the Zodiac Killer can also be challenging, especially when the ciphertexts are short. On the other hand, techniques for breaking historical ciphers have recently made considerable progress. Computer-based cryptanalysis methods such as hill climbing and simulated annealing have been successfully applied to break original WWII Enigma messages, as well as one of the world's most famous unsolved codes, a 1970 ciphertext sent by the Zodiac Killer. The record in solving short Playfair messages has improved: whereas many years ago the shortest Playfair ciphertext that could be cracked required a minimum of 60 letters, now messages as short as 26 letters have been solved. However, many other historical ciphertexts are still unbroken to date. This presentation will introduce the most important historical ciphers, and modern techniques to break them.

Page last updated:

October 2, 2021

Register for ICCH

Thank you. You are now registered and will receive a confirmation email shortly.
Oops! Something went wrong while submitting the form. Please try again.

Welcome to the home page of the International Conference on Cryptologic History (ICCH).

Welcome to the home page of the International Conference on Cryptologic History (ICCH).

Register for ICCH

Thank you. You are now registered and will receive a confirmation email shortly.
Oops! Something went wrong while submitting the form. Please try again.

Speakers
Presentations
Useful Links
ICCH File Drive
Contact

Upcoming Presentations

Live presentations are held online every fortnight, covering topics including cipher machines/devices, as well as codes and codebreaking from the world's leading experts on cryptologic history.

Here is a list of upcoming presentations at ICCH. The next presentation is shown at the top. Click on each listing to reveal more information below, including the speaker, date and presentation description.

Note: Effort has been made to ensure that the information on each presentation is accurate and up-to-date. To suggest a correction please contact the ICCH webmaster Patrick Hayes at info@cryptologichistory.org.

Presentation:

Solving Historic Ciphers with Modern Means

Speaker(s):
Date & time (UTC/GMT):
October 3, 2021 5:00 PM
Description:

Many old encryption methods are still hard to break today. For instance, cryptanalyzing a short 19th century Playfair cipher is far from trivial. WW2 Enigma messages, spy ciphers from the Cold War, and manual methods used by criminals such as the Zodiac Killer can also be challenging, especially when the ciphertexts are short. On the other hand, techniques for breaking historical ciphers have recently made considerable progress. Computer-based cryptanalysis methods such as hill climbing and simulated annealing have been successfully applied to break original WWII Enigma messages, as well as one of the world's most famous unsolved codes, a 1970 ciphertext sent by the Zodiac Killer. The record in solving short Playfair messages has improved: whereas many years ago the shortest Playfair ciphertext that could be cracked required a minimum of 60 letters, now messages as short as 26 letters have been solved. However, many other historical ciphertexts are still unbroken to date. This presentation will introduce the most important historical ciphers, and modern techniques to break them.

Page last updated:

October 2, 2021

Register for ICCH

Thank you. You are now registered and will receive a confirmation email shortly.
Oops! Something went wrong while submitting the form. Please try again.

Welcome to the home page of the International Conference on Cryptologic History (ICCH).