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