Yes, maybe I haven't been clear, I tried just to explain what an hash is before introducing hash tables, if someone understood that cryptographic hash functions have to be used for hash table it's probably because my explanation wasn't clear enough... :(

Consider that I'm not a native speaker, so sometimes it's hard for me to send the exact message I would like to send... I will try to explain it better as soon as I will get anywhere I can use a computer :)

Thanks!