Cryptanalysis Essentials: Cost & Fitness Functions in Language Models 🔍

#cryptology, #cryptography, #cryptanalysis, #lecture, #course, #tutorial

In this video, we show the basics of cryptology (cryptology = cryptography and cryptanalysis).

This video here gives an introduction and overview of cost functions. We use cost functions in heuristics like hill climbing, simulated annealing, and genetic algorithms. This particular video here introduces language models. A language model assigns a float value to a given text, which indiciates how close the text content is to a language, e.g. English. As a rule of thumb, one can say, that the "better" a key in our cryptanalysis of a classical cipher is, the "better" is the cost value.

If you want to have a look at hill climbing, you may watch our video about that (Part 8 of this series): https://youtu.be/RB5rDdEAF7U
Here is a video about genetic algorithms (Part 10 of this series): https://youtu.be/-fKswAHcUdQ
And here is a video about entropy (Part 4 of this series): https://youtu.be/76eBFVBnYnQ

To see all videos in the "Basics of Cryptology" series, use this playlist: https://www.youtube.com/playlist?list=PLMuvAbyIl0PT6zaRVpK0FCSNMgwAOckTt

If you are interested in details about CrypTool 2, you may have a look at this video here, which gives a short introduction: https://www.youtube.com/watch?v=dELT2-Vgsr8

Finally, you may download the latest version of CrypTool 2 here: https://www.cryptool.org/en/ct2/downloads
Like what I do 😄? Help fuel my crypto obsession 🎓 — buy me a coffee here☕— thx: https://buymeacoffee.com/cryptographyforeverybody