Cryptology ePrint Archive: Report 2017/987

Key Dependent Message Security and Receiver Selective Opening Security for Identity-Based Encryption

Fuyuki Kitagawa and Keisuke Tanaka

Abstract: We construct two identity-based encryption (IBE) schemes. The first one is IBE satisfying key dependent message (KDM) security for user secret keys. The second one is IBE satisfying simulation-based receiver selective opening (RSO) security. Both schemes are secure against adaptive-ID attacks and do not have any a-priori bound on the number of challenge identities queried by adversaries in the security games. They are the first constructions of IBE satisfying such levels of security.

Our constructions of IBE are very simple. We construct our KDM secure IBE by transforming KDM secure secret-key encryption using IBE satisfying only ordinary indistinguishability against adaptive-ID attacks (IND-ID-CPA security). Our simulation-based RSO secure IBE is based only on IND-ID-CPA secure IBE.

We also demonstrate that our construction technique for KDM secure IBE is used to construct KDM secure public-key encryption. More precisely, we show how to construct KDM secure public-key encryption from KDM secure secret-key encryption and public-key encryption satisfying only ordinary indistinguishability against chosen plaintext attacks.

Category / Keywords: public-key cryptography / Identity-based encryption, Key dependent message security, Receiver selective opening security

Original Publication (with minor differences): IACR-PKC-2018

Date: received 7 Oct 2017, last revised 12 Jan 2018

Contact author: kitagaw1 at is titech ac jp

Available format(s): PDF | BibTeX Citation

Version: 20180112:080414 (All versions of this report)

Short URL: ia.cr/2017/987