09-10-2012, 04:37 PM
Privacy-Preserving Multi-keyword Ranked Searchover Encrypted Cloud Data
Privacy-Preserving Multi-keyword .ppt (Size: 1.68 MB / Downloads: 27)
PROBLEM FORMULATION
Threat Model
Known Ciphertext Model
only know encrypted dataset C and searchable index I
Known Background Model
know encrypted dataset C , searchable index I and some backgrounds on the dataset
Preliminary on Coordinate Matching
a hybrid of conjunctive search and disjunctive
search
uses the number of query keywords appearing in
the document to quantify the similarity of that
document to the query
CONCLUSION
Coordinate Matching
as many matches as possible
Inner Product Similarity
Basic MRSE Scheme
Privacy-Preserving Scheme in Known Ciphertext Model
Privacy-Preserving Scheme in Known
Background Mode