From: PKIS: practical keyword index search on cloud datacenter
Identifier of documents
Encrypted document
f k c ( d 1 )
f k c ( f d k 1 1 ( D 1 ) )
f k c ( d 2 )
f k c ( f d k 1 2 ( D 2 ) )
...
f k c ( d 7 )
f k c ( f d k 3 1 ( D 7 ) )
f k c ( d 8 )
f k c ( f d k 2 3 ( D 8 ) )
f k c ( d 9 )
f k c ( f d k 3 2 ( D 9 ) )
f k c ( d 1 1 4 )
f k c ( f d k 1 1 1 3 ( D 1 1 4 ) )
f k c ( d 5 6 1 )
f k c ( f d k 8 2 2 ( D 5 6 1 ) )
f k c ( d n )
f k c ( f d k l s ( D n ) )