NDLI: Cryptanalysis of Bohio et al.'s ID-Based Broadcast Signcryption (IBBSC) Scheme for Wireless Ad-Hoc Networks

Content Provider	IEEE Xplore Digital Library
Author	Sharmila Deva Selvi, S. Sree Vivek, S. Karuturi, N.N. Gopalakrishnan, R. Chandrasekaran, P.R.
Copyright Year	2008
Description	Author affiliation: Dept. of Comput. Sci. & Eng., Indian Inst. of Technol. Madras, Chennai (Sharmila Deva Selvi, S.; Sree Vivek, S.; Karuturi, N.N.; Gopalakrishnan, R.; Chandrasekaran, P.R.)
Abstract	Broadcast signcryption enables the broadcaster to simultaneously encrypt and sign the content meant for a specific set of users in a single logical step. It provides a very efficient solution to the dual problem of achieving confidentiality and authentication during content distribution. Among other alternatives, ID-based schemes are arguably the best suited for its implementation in wireless ad-hoc networks because of the unique advantage that they provide - any unique, publicly available parameter of a user can be his public key, which eliminates the need for a complex public key infrastructure. In 2004, Bohio et al. proposed an ID-based broadcast signcryption (IBBSC) scheme which achieves constant ciphertext size. They claim that their scheme provides both message authentication and confidentiality, but do not give formal proofs. In this paper, we demonstrate how a legitimate user of the scheme can forge a valid signcrypted ciphertext, as if generated by the broadcaster. Moreover, we show that their scheme is not IND-CCA secure. Following this, we propose a fix for Bohio et al.'s scheme, and formally prove its security under the strongest existing security models for broadcast signcryption (IND-CCA2 and EUF-CMA). While fixing the scheme, we also improve its efficiency by reducing the ciphertext size to two elements compared to three.
Starting Page	109
Ending Page	120
File Size	284115
Page Count	12
File Format	PDF
ISBN	9780769533902
DOI	10.1109/PST.2008.29
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-01
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Probabilistic logic Ad hoc networks Security Broadcast Encryption Bilinear Pairing Public key Games Signcryption ID-Based Cryptography Cryptanalysis Polynomials Cryptography Ad-hoc Networks
Content Type	Text
Resource Type	Article

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