1. I was a little confused about Error Correcting Codes. About to the Notation on page 401 it starts talking about code lengths and codewords... what is the difference? I think I am confused too on what distance is too. Equivalence was also throwing me off a bit too. How are they equivalent when we Permute the symbols? It's all really new and I have to remember sets and stuff again..
2. It's interesting how cryptography and coding theory differ. One is sending messages over nonsecure channels, and one is sending messages over noisy channels. I wonder if there are times when both are used at the same time? I could see someone failing to send a clear message with the examples we learned about with one time pads, where the random integers were made from computers or other random-ish things. In circumstances like that though, it seems like a ciphertext would be even easier to break since you might need to send the key more then once, but could also have potential to be harder to break! I wonder which it really is.
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