However, the authentication device or method may also be used to authenticate {HEAD ~ a user} to the remote service, or indeed, mutually authenticate {TAIL ~ a remote service} and a user 
However , the authentication device or method may also be used to authenticate { HEAD ~ a user } to the remote service , or indeed , mutually authenticate { TAIL ~ a remote service } and a user
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH