Basics of Cryptology – Part 3 (Modern Symmetric Ciphers – Stream Ciphers & Block Ciphers)

#cryptology, #cryptography, #cryptanalysis

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

This third video in a series about cryptology gives an introduction to modern symmetric ciphers. We first present the basics of modern ciphers. Then, we show the basic ideas of stream and block ciphers. Finally, we present two different block modes (of operation) for modern block ciphers, namely electronic code book (ECB) mode and cipher block chaining (CBC) mode. We also present stream and block ciphers (and how to create workspaces for these) in CrypTool 2. Additionally, we show why using ECB mode is a bad idea and one should prefer CBC mode (despite, that CBC has other flaws and should be replaced by more modern block modes - details on these in later videos).

Hint: Both modern ciphers shown in this video, RC4 and DES, should not be used any more for encryption in applications. RC4 is broken and pure DES (56bit key length) can be broken with special hardware or computing clouds within a few hours.

In upcoming videos we will have a look at building blocks of modern symmetric ciphers as well as on asymmetric ciphers.

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 3 (Modern Symmetric Ciphers – Stream Ciphers & Block Ciphers) канала Cryptography for Everybody