Cryptology ePrint Archive: Report 2017/219

Attribute-Based Encryption from Identity-Based Encryption

Chun-I Fan and Yi-Fan Tseng and Chih-Wen Lin

Abstract: Ciphertext-policy attribute-based encryption (CP-ABE) is an access control mechanism where a data provider encrypts a secret message and then sends the ciphertext to the receivers according to the access policy which she/he decides. If the attributes of the receivers match the access policy, then they can decrypt the ciphertext. This paper shows a relation between ABE and identity-based encryption (IBE), and presents a bi-directional conversion between an access structure and identities. By the proposed conversion, the ABE scheme constructed from an IBE scheme will inherit the features, such as constant-size ciphertexts and anonymity, from the IBE scheme, and vice versa. It turns out that the proposed conversion also gives the first ABE achieving access structures with wildcard and constant-size ciphertexts/private keys. Finally, we prove the CCA security for confidentiality and anonymity.

Category / Keywords: public-key cryptography / attribute-based encryption, identity-based encryption, constant-size ciphertexts/keys, hidden access policies, anonymity, public-key cryptography

Date: received 2 Mar 2017

Contact author: cifan at mail cse nsysu edu tw

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Version: 20170304:141637 (All versions of this report)

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