Basics of Cryptology – Part 4 (Modern Cryptanalysis – Shannon's Entropy and Brute-Force Attack)

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

This particular video introduces the Shannon's information entropy, which we use for a brute-force attack on a (keyspace-reduced) DES cipher.

First, we give a short historical overview on the term "entropy". Then, we discuss the Shannon's information entropy, which is a measure for the value of information of data. Finally, we use the Cost Function component in CrypTool 2 to have a look at entropy values of plaintext and ciphertext and we also use the CrypTool 2 KeySarcher component to break a DES cipher-encrypted ciphertext (with a search space of 24 bit).

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

If you are further interested in details on classic ciphers, you may have a look at the classic ciphers playlist: https://www.youtube.com/watch?v=VLXuLbclCxw

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

Видео Basics of Cryptology – Part 4 (Modern Cryptanalysis – Shannon's Entropy and Brute-Force Attack) канала Cryptography for Everybody