Conditional identity based broadcast proxy re-encryption and its application to cloud email

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This paper proposes a new cryptographic primitive called conditional identity-based broadcast proxy re-encryption (CIBPRE) that allows a sender to encrypt a message for multiple receivers using their identities. The sender can then delegate a re-encryption key to a proxy to convert the ciphertext into a new one for a different set of receivers, conditioned on a certain attribute. An efficient CIBPRE scheme is presented with constant-sized ciphertexts and keys. Finally, the paper discusses how CIBPRE can be applied to build a secure cloud email system.

Conditional Identity-Based Broadcast Proxy Re-Encryption and Its
Application to Cloud Email
Abstract:
Recently, a number of extended Proxy Re-Encryptions (PRE), e.g. Conditional
(CPRE), identity-based PRE (IPRE) and broadcast PRE (BPRE), have been proposed
for flexible applications. By incorporating CPRE, IPRE and BPRE, this paper
proposes a versatile primitive referred to as conditional identity-based broadcast
PRE (CIBPRE) and formalizes its semantic security. CIBPRE allows a sender to
encrypt a message to multiple receivers by specifying these receivers' identities,
and the sender can delegate a re-encryption key to a proxy so that he can convert
the initial ciphertext into a new one to a new set of intended receivers. Moreover,
the re-encryption key can be associated with a condition such that only the
matching ciphertexts can be re-encrypted, which allows the original sender to
enforce access control over his remote ciphertexts in a fine-grained manner. We
propose an efficient CIBPRE scheme with provable security. In the instantiated
scheme, the initial ciphertext, the re-encrypted ciphertext and the re-encryption
key are all in constant size, and the parameters to generate a re-encryption key
are independent of the original receivers of any initial ciphertext. Finally, we show
an application of our CIBPRE to secure cloud email system advantageous over
existing secure email systems based on Pretty Good Privacy protocol or identity-
based encryption.

This document proposes a new cryptographic primitive called conditional identity-based broadcast proxy re-encryption (CIBPRE) that allows flexible and fine-grained access control of encrypted data stored remotely in the cloud. CIBPRE incorporates advantages of conditional proxy re-encryption, identity-based encryption, and broadcast encryption. The proposed CIBPRE scheme is more efficient than existing solutions based on public key infrastructure or identity-based encryption for applications like secure cloud email systems.

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International Journal of Engineering and Science Invention (IJESI)

inventionjournals

International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online

literature survey for identity based secure distributed data storage

Sahithi Naraparaju

1) The document discusses various identity-based secure distributed data storage schemes including atomic proxy crypto systems, identity-based crypto systems introduced by Shamir, and identity-based proxy encryption proposed by Ivan and Dodis. 2) It also covers identity-based proxy re-encryption proposed by Green and Ateniese where a proxy server can transfer a ciphertext from an original decryptor to a designated decryptor using a re-encryption key. 3) These schemes are classified into two types based on how the re-encryption key is generated: either by the original decryptor or by a private key generator.

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Conditional identity based broadcast proxy re-encryption and its application to cloud email

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