I thought that DES was very interesting. I have never seen a cryptographic algorithm like this before and with it multiple rounds and different steps. I understand how it works, kind of, but I did not completely understand the specific details of the encryption/decryption process.
In the introduction, it said that some people were afraid that IBM or the NSA had put in a trapdoor in the algorithm. This is interesting because this is what Dan Brown's novel Digital Fortress is about. Do you know if there have been recorded instances of people or organizations getting caught with a trapdoor?
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