Encryption Before Compression or Compression Before Encryption?

In the video, we answer the question, if we should first encrypt and then compress or first compress and then encrypt.

We have a small test setup with three different file types (bmp, jpg, and txt). For each type, we have a test file, which we first zip and then encrypt (using AES) and then first encrypt and then zip. Which file will be the smallest one :-) ?

Finally, we have a look a the entropy values of each of the files and compare these values. If you want to know, what entropy means, please have a look at this video here: https://www.youtube.com/watch?v=76eBFVBnYnQ
After this video, you should see what makes more sense when working with compression and encryption.

If you are interested in learning the basics of cryptology, you should also have a look at our video series about basics of cryptology – also for beginners: https://youtu.be/jbumW7Ym03o

You may download the latest version of CrypTool 2 from here: https://www.cryptool.org/en/ct2/downloads

Видео Encryption Before Compression or Compression Before Encryption? канала Cryptography for Everybody