If the result of the test in step 401 is NO, then in step 402, {TAIL ~ the normally unaccessible data} is encrypted with {HEAD ~ the symmetrical encryption Key} 
If the result of the test in step 401 is NO , then in step 402 , { TAIL ~ the normally unaccessible data } is encrypted with { HEAD ~ the symmetrical encryption Key }
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 OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD