In reading this section, I didn't quite understand how the birthday attack was to be used on weak hash functions, or how the multicollisions described would occur with such frequency. Also, the reasoning behind why concatenating weak hash functions doesn't increase the strength was rather mysterious to me.
Still, it was interesting to see how hash functions could be applied crytographically. I think the it's interesting to try to find things that are pseudorandom or appear random, and thus can be used in cryptography.
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