One or more crypto processing segments {HEAD ~ each} operate based on {TAIL ~ corresponding ones} of the k key fragments to process a message in accordance with elliptic curve digital signature algorithm to produce a signed message 
operate based on
One or more crypto processing segments { HEAD ~ each } operate based on { TAIL ~ corresponding ones } of the k key fragments to process a message in accordance with elliptic curve digital signature algorithm to produce a signed message
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH