Key Encapsulation Mechanism in Ciphertext-policy Attribute based Setting Featuring Revocation and Key-homomorphic Property

Anushree Belel, Ratna Dutta, Sourav Mukhopadhyay

2022

Abstract

Cloud computing is a paradigm shift from traditional computing to process, store and share data in an untrusted environment with emerging applications in medical fields, online data storage, social network, big data analysis and online learning platforms. As more and more organizations, business platforms, individuals are choosing cloud, it is very urgent to ensure data security and privacy in the cloud. To safeguard data breaches, it is important to provide fine-grained access control on encrypted data in the cloud. Ciphertext-policy attribute based encryption (CP-ABE) is a promising advanced cryptographic primitive that monitors fine-grained access control of sensitive data in untrusted cloud environment. The revocable CP-ABE (RCP-ABE) is an extension of CP-ABE which facilitates direct user revocation from the system. In this work, we introduce a refined encapsulated version of RCP-ABE, called key-homomorphic revocable ciphertext-policy attribute based key encapsulation mechanism (RCP-ABKEM). Interesting features of this primitive is that it supports extended correctness and key-homomorphism along with normal correctness requirement. Our work is inspired by the work of Sun et al. (PKC 2020) who introduced the notion of key-homomorphic identity based revocable key encapsulation mechanism (IRKEM). We generalize the notion of key-homomorphic IRKEM in attribute based setting and provide an instantiation of key-homomorphic RCP-ABKEM. We support the conjectured security of our candidate by analysis and prove that the scheme achieves selective security against chosen plaintext attack (CPA) under the q-decisional bilinear Diffie-Hellman exponent (q-DBDHE) assumption in the standard model. More interestingly, when contrasted with existing similar scheme, our scheme exhibits better performance over the existing similar schemes in terms of communication overhead and master secret key size and is the first scheme in attribute setting that preserves key homomorphic property. As a refined primitive, key-homomorphic RCP-ABKEM is of independent interest and may be utilized as a building block for generic construction of new cryptographic primitive.

Paper Citation

in Harvard Style

Belel A., Dutta R. and Mukhopadhyay S. (2022). Key Encapsulation Mechanism in Ciphertext-policy Attribute based Setting Featuring Revocation and Key-homomorphic Property. In Proceedings of the 19th International Conference on Security and Cryptography - Volume 1: SECRYPT, ISBN 978-989-758-590-6, pages 349-356. DOI: 10.5220/0011271600003283

in Bibtex Style

@conference{secrypt22,
author={Anushree Belel and Ratna Dutta and Sourav Mukhopadhyay},
title={Key Encapsulation Mechanism in Ciphertext-policy Attribute based Setting Featuring Revocation and Key-homomorphic Property},
booktitle={Proceedings of the 19th International Conference on Security and Cryptography - Volume 1: SECRYPT,},
year={2022},
pages={349-356},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0011271600003283},
isbn={978-989-758-590-6},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 19th International Conference on Security and Cryptography - Volume 1: SECRYPT,
TI - Key Encapsulation Mechanism in Ciphertext-policy Attribute based Setting Featuring Revocation and Key-homomorphic Property
SN - 978-989-758-590-6
AU - Belel A.
AU - Dutta R.
AU - Mukhopadhyay S.
PY - 2022
SP - 349
EP - 356
DO - 10.5220/0011271600003283