Publication Details

Susilo, W., Mu, Y., Huang, X. & Zhang, F. (2005). Identity-based ring signcryption schemes: cryptographic primitives for preserving privacy and authenticity in the ubiquitous world. In T. Shih & Y. Shibata (Eds.), International Conference on Advanced Information Networking and Applications (pp. 649-654). USA Piscataway New Jersey: The Institute of Electrical and Electronics Engineers.


In this paper, we present a new concept called an identity based ring signcryption scheme (IDRSC,). We argue that this is an important cryptographic primitive that must be used to protect privacy and authenticity of a collection of users who are connected through an ad-hoc network, such as Bluetooth. We also present an efficient IDRSC scheme based on bilinear pairing. As a regular signcryption scheme, our scheme combines the functionality of signature and encryption schemes. However, the idea is to have an identity based system. In our scheme, a user can anonymously sign-crypts a message on behalf of the group. We show that our scheme outperforms a traditional identity based scheme, that is obtained by a standard sign-then-encrypt mechanism, in terms of the length of the ciphertext. We also provide a formal proof of our scheme with the chosen cipher-text security under the decisional bilinear Diffie-Hellman assumption, which is believed to be intractable.



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