After an initial reading about DES encryption my head started to spin a little bit. I have tried to back up and read through section 4.2 a few more times to at least understand the concept. However the confusing part lies in 4.4. Talking about splitting up and sending different parts of the plaintext different places was often hard to follow. Also the part about using different S-boxes wasn't overly clear to me.
Something that I DID understand, and thought was interesting was how companies like banks might use two different types of encryption for their data. We read about how they might send the key to the next cryptosystem via a previous one. I had been wondering how different companies might receive keys from the senders without loss of security. Using public key encryption to send it was something that I had not thought of before.
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