IACR News item: 27 August 2014
TIAN Youliang, PENG Changgen
ePrint Reportcomposable framework. We first propose the group communication
model, identity-based signcrytion model and group key distribution model in the UC framework by
designing the ideal functionality $\\mathcal {F}_{SAGCOM}$, $\\mathcal
{F}_{IDSC}$ and $\\mathcal {F}_{GKD}$, respectively. Then, we construct
a UC secure identity-based signcryption protocol $\\pi_{IDSC}$. Moreover,
we shows that the identity-based signcryption $\\pi_{IDSC}$ securely realizes the ideal functionality $\\mathcal {F}_{IDSC}$ if
and only if the corresponding protocol IDSC is secure. Finally, based on the identity-based protocol, we propose a group communication scheme
$\\pi_{SAGCOM}$, which can securely realizes the ideal functionality
$\\mathcal {F}_{SAGCOM}$ in the $(\\mathcal {F}_{IDSC},\\mathcal
{F}_{GKD})$-hybrid model.
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