we don't want change standard just after every attack, now for AES 128bit blocks i think 16 round is secure, but what is best round amount ? we had attack for 7 round then 10 round and it going so on i think so is better we use a better standard. how many round you think we use is better for a long time ?
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The AES standard specifies the use of 10 rounds with 128-bit keys. Anything other than this is, by definition, not AES. There are no known effective attacks against standard AES-128.