On initialization, and again every PERIOD, generate salt using 128bits from arc4random_buf(). On each request, generate masked IP address as HASH(salt ++ IP address). Log masked IP address. ipscrub uses arc4random to generate random nonces (see Theo de Raat's talk on arc4random for a great overview). On Linux this requires installing libbsd (package libbsd-dev on Ubuntu/Debian). ALSO NOTE: the gen

