Authors:
Keita Emura
1
and
Mohammad Shahriar Rahman
2
Affiliations:
1
National Institute of Information and Communications Technology (NICT), Japan
;
2
University of Asia Pacific, Bangladesh
Keyword(s):
Adaptive Secure-channel Free Public Key Encryption Scheme with Keyword Search, IBE with Partitioned Ciphertext Structure.
Related
Ontology
Subjects/Areas/Topics:
Applied Cryptography
;
Cryptographic Techniques and Key Management
;
Data Engineering
;
Databases and Data Security
;
Information and Systems Security
;
Security Protocols
Abstract:
As an extension of public key encryption with keyword search (PEKS), secure channel free PEKS (SCF-PEKS)
has been considered. Generic construction of SCF-PEKS (with adaptive security) from strongly existentially
unforgeable one-time signature, selective-tag CCA secure tag-based encryption (TBE) and anonymous
identity-based encryption (IBE) has been proposed in ISC2011. Since this construction follows the
double encryption, where a ciphertext of anonymous IBE is encrypted by TBE, hybrid encryption is applied
because usually the ciphertext space of IBE is not equal to the plaintext space of TBE. In this paper, we
show that hybrid encryption is not necessary as long as previously-known anonymous IBE schemes are used
as a building tool of adaptive SCF-PEKS. Our result leads to a composability of IBE schemes whether they
can be applied for constructing adaptive SCF-PEKS or not. Moreover, since we can exclude DEM part, our
construction is efficient compared to the original one.