Actually, my question isn’t so much about the methods themselves as about what sorts of questions can sensibly be posed for discussion with minimal knowledge.
I’m teaching a crypto course for bright young students this summer (CTY’s summer program, for those who know it). They’ve been through shifts, affine ciphers, substitutions, Vigenére, and spent all today on Enigma. Tomorrow and Monday I’m planning on talking about DES, Blowfish, IDEA, and R?ndael, or at least describing them and waving my hands a lot. The thing is, it’s best to break up lectures with some small-group discussion questions or individual exercises. I can’t really ask them to perform a DES encryption, much less try to break it. What would be good questions to ask them to discuss among two or three of their classmates?
(apologies if this is the wrong forum)