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Identity-Based On-Line/Off-Line Signcryption

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4 Author(s)
Dongdong Sun ; Sch. of Comput. Sci. & Software Eng., Univ. of Wollognong, Wollongong, NSW ; Xinyi Huang ; Yi Mu ; Susilo, W.

We present an identity-based online/offline signcryption scheme, where most of computations are carried out when the message is not available (i.e., off-line stage) and the online part of our scheme does not require any exponent computations and therefore is very efficient. It combines the functionalities of signature and encryption and is provably secure in the random oracle model. We also show that our scheme is indistinguishable against adaptive chosen-ciphertext attacks (IND-IDSC-CCA2) and is existentially unforgeable against adaptive chosen-message attacks (EF-IDSC-ACMA).

Published in:

Network and Parallel Computing, 2008. NPC 2008. IFIP International Conference on

Date of Conference:

18-21 Oct. 2008