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A new Key-Insulated group signature scheme is proposed under standard model. This paper takes advantage of helpers to help update member keys in every time section, meets the forward security and backward security.
In this paper, we present a two-party identity-based key agreement protocol, which is provably secure without random oracles under three static assumptions. It is inspired on a new identity-based encrypt system proposed in TCC 2010 by Lewko and Waters. We show how this key agreement can be used in either escrowed or escrowless mode. We also modify the protocol in the escrow to provide perfect forward...
In this paper, an identity-based multi signature scheme (IBMS) is presented. Many applications require that public keys of the signers to be sent along the signature. Identity strings are likely to be much shorter than randomly generated public keys and are easily verifiable with other applications such as mail or Web pages. This property makes the identity based paradigm appealing in such a situation...
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