International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Dimitrios Papadopoulos

Affiliation: University of Maryland

Publications

Year
Venue
Title
2018
CRYPTO
Searchable Encryption with Optimal Locality: Achieving Sublogarithmic Read Efficiency 📺
We propose the first linear-space searchable encryption scheme with constant locality and sublogarithmic read efficiency, strictly improving the previously best known read efficiency bound (Asharov et al., STOC 2016) from $$\varTheta (\log N \log \log N)$$Θ(logNloglogN) to $$O(\log ^{\gamma } N)$$O(logγN) where $$\gamma =\frac{2}{3}+\delta $$γ=23+δ for any fixed $$\delta >0$$δ>0 and where N is the number of keyword-document pairs. Our scheme employs four different allocation algorithms for storing the keyword lists, depending on the size of the list considered each time. For our construction we develop (i) new probability bounds for the offline two-choice allocation problem; (ii) and a new I/O-efficient oblivious RAM with $$\tilde{O}(n^{1/3})$$O~(n1/3) bandwidth overhead and zero failure probability, both of which can be of independent interest.
2016
ASIACRYPT
2015
EPRINT
2014
PKC
2014
EPRINT
2014
EPRINT