Basics of Cryptology – Part 6 (Modern Cryptography – Block Ciphers – SPN Ciphers)

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

This particular video shows in detail how modern symmetric substutition permutation networks (SPN), which are block ciphers, are built and work.

First, we discuss in detail the internal workings of SPN ciphers, like S-boxes, P-boxes, and XOR operations and their requirements. After that, we discuss two toy SPN ciphers [1,2] (32bit and 64bit), which are also implemented in CT2.

Then, we show both toy ciphers in CT2 and "play" with its inputs (plaintext, round keys).

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

[1] Knudsen, Lars R. and Robshaw, Matthew – The Block Cipher Companion, Springer, 2011, https://www.springer.com/de/book/9783642173417

[2] Muharrem Tolga Sakall et. al., DIFFERENTIAL CRYPTANALYSIS FOR A 3-ROUND SPN, 2005, https://pdfs.semanticscholar.org/dee2/23a06f16f6d6939b363d56b6af5a2c9edbee.pdf

Видео Basics of Cryptology – Part 6 (Modern Cryptography – Block Ciphers – SPN Ciphers) канала Cryptography for Everybody