# Constructing Secure-channel Free Searchable Encryption from Anonymous IBE with Partitioned Ciphertext Structure

### Keita Emura, Mohammad Shahriar Rahman

#### 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.

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#### Paper Citation

#### in Harvard Style

Emura K. and Shahriar Rahman M. (2012). **Constructing Secure-channel Free Searchable Encryption from Anonymous IBE with Partitioned Ciphertext Structure** . In *Proceedings of the International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2012)* ISBN 978-989-8565-24-2, pages 84-93. DOI: 10.5220/0004022700840093

#### in Bibtex Style

@conference{secrypt12,

author={Keita Emura and Mohammad Shahriar Rahman},

title={Constructing Secure-channel Free Searchable Encryption from Anonymous IBE with Partitioned Ciphertext Structure},

booktitle={Proceedings of the International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2012)},

year={2012},

pages={84-93},

publisher={SciTePress},

organization={INSTICC},

doi={10.5220/0004022700840093},

isbn={978-989-8565-24-2},

}

#### in EndNote Style

TY - CONF

JO - Proceedings of the International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2012)

TI - Constructing Secure-channel Free Searchable Encryption from Anonymous IBE with Partitioned Ciphertext Structure

SN - 978-989-8565-24-2

AU - Emura K.

AU - Shahriar Rahman M.

PY - 2012

SP - 84

EP - 93

DO - 10.5220/0004022700840093