HCV: Practical Multi-Keyword Conjunctive Query with Little Result Pattern Leakage

Table 2

Notations and terminologies.

Notation	Meaning
	A security parameter
	The document identifier of the ith document
n	Number of documents in the database
	All contained in idi
	(label, value) pairs
W, K	The set of all keywords, the key used to encrypt
D	The set of all documents
DB, EDB	Database , encrypted DB
DB (), coDB ()	Inverted index , keywords co-occurring with
MM, EMM	Multi-map, encrypted MM
CV, ECV	Counter vector, encrypted CV