The system 1, wherein the challenge response server computer comprises a device information module configured to obtain information on {HEAD ~ a device} used by {TAIL ~ the consumer} to conduct the transaction 
used by
The system 1 , wherein the challenge response server computer comprises a device information module configured to obtain information on { HEAD ~ a device } used by { TAIL ~ the consumer } to conduct the transaction
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH