Abstract
In this paper we introduce the first group key transfer protocol secure in the lattice-based environment which achieves anonymity of the members against each others. This issue is almost absent in the key transfer protocols from the literature but we argue it is a practical property. We use two essential cryptographic primitives for our protocol: lattice Diffie-Hellman key exchange derived from Regev’s work [11] and a public key cryptosystem secure from the LWE hardness and we achieve IND-CPA anonymity.
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