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