4 ms·
They recorded the whole response. "...and the second one simply writes down the response packets received." They also randomized the order in which they scanned
by e2e8 14y ago
They recorded the whole response. "...and the second one simply writes down the response packets received." They also randomized the order in which they scanned so they might have needed to keep track of already scanned addresses. "Although we have sent just a single packet per IP, we messed the scans to prevent a network receiving a high number of consecutive packets."
- jevinskie 14y agoYou can use a LFSR[0] to efficiently (it is deterministic, minimal state) convert a sequential power of two range [0, 2^n-1] into one that appears to "randomly" walk around. [0]: http://en.wikipedia.org/wiki/Linear_feedback_shift_register http://en.wikipedia.org/wiki/Linear_feedback_shift_register
- mrab 14y agoYeah, I could think of a handful of ways to do this easily without as much resources as stated...
- tonyedgecombe 14y agoOr just reverse the bits in the address.