Isn't it more like a <number of pending transfers>-out-of-65536 chance of getting it right? If there are 256 pending transfers, then it's more of a 1 in 256 cha

Isn't it more like a <number of pending transfers>-out-of-65536 chance of getting it right? If there are 256 pending transfers, then it's more of a 1 in 256 chance of stealing someone's information? The more popular this program gets, the easier it is to steal people's information?