Dynamic Verifiable Encrypted Keyword Search Using Bitmap Index and Homomorphic MAC

Abstract

Searchable Symmetric Encryption (SSE) is a technique to securely outsource the data, which is encrypted using symmetric key primitives, while maintaining search functionality. While several solutions have been proposed to realize SSE over various data structures, the efficient solution using inverted index is due to Curtmola et.al. Hwang et.al. introduced a SSE scheme based on bitmaps in order to reduce the index size. In this paper, we consider Searchable Symmetric Encryption (SSE) in the presence of a Semi-Honest-But-Curious Cloud Service Provider (SHBC-CSP). We have defined a new security notion for SSE in presence of SHBC-CSP, contrived two new SSE schemes and proved their security formally in the proposed security notion. Dynamic Verifiable Encrypted Keyword Search (DVSSE), is the first SSE scheme to the best of our knowledge, which is both dynamic and verifiable. We have implemented our schemes, compared their performance and complexity with existing schemes.