Actually factorable.net does have code. Planning to analyze the 1200 user keys I have around to see if any are weak. From what I can tell you can just convert public keys into hex and feed them into their program.
Yes, but it will only batch-factor the 1200 keys you'd be feeding it with. For such factorization attacks to work best, you need a dataset as large as possible.
Tried a few, doesn't seem to handle more than one key well. Worried that 1500 submissions would cause a DoS. After a few it stopped giving me results saying computations were queued.
