hello,
     when  i read some books about cryptography, it always go that the
cryptography is based on the difficult math problem, for example big
integer decomposition,
i don't understand it, for if we know that n = p*q , p, q are prime ,
why it's difficult to get p and q ? i think ,if we know the big
integer and it is mul of  two prime number. we can get prime number
and test whether p*q == n, why people say it 's a difficult problem?
may be my understanding is not right? someone who knows please tell me
, thank you very much

sincerely
 jazz-lee
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