In a preferred embodiment, {TAIL ~ the present invention} comprises an authentication engine, an authentication host, and a plurality of providers coupled to the host, each provider implementing {HEAD ~ a selected authentication scheme} 
In a preferred embodiment , { TAIL ~ the present invention } comprises an authentication engine , an authentication host , and a plurality of providers coupled to the host , each provider implementing { HEAD ~ a selected authentication scheme }
OTH OTH OTH OTH OTH TAIL 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD