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Digital signature is an important authentication technique. Most of digital signature schemes don't satisfy strong unforgeability and only are proven secure in the random oracle model. It is a challenge to construct an ID-based digital signature scheme with strong unforgeability in the standard model. To overcome this problem, in this paper, we propose a strongly unforgeable identity-based signature...
The focus of this paper is to design an efficient and secure solution addressing the key escrow problem in proxy re-signature schemes, i.e., the proxy knows the user's private key, which damages the essential requirement - "non-repudiation" property of proxy re-signature schemes. In this paper, we first define the security model for threshold proxy re-signature scheme, and then propose two...
A fair exchange protocol allows two parties to exchange items in a fair way so that either each party gets the other's item or neither party does. In this paper, we propose a key-exposure-free chameleon hashing scheme based on the discrete logarithm assumption, and prove that it enjoys all advantages of previous schemes: collision resistant, semantic security, message hiding and key exposure freeness...
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