Towards Anonymous Ciphertext Indistinguishability with Identity Leakage
作者： Tsz Hon Yuen , Cong Zhang , Sherman S. M. Chow , Joseph K. Liu
DOI: 10.1007/978-3-642-41227-1_8
关键词:
摘要: Key escrow is a major drawback of identity-based encryption (IBE). The key generation centre (KGC) can generate the user secret any by using master and user's identity. This paper presents systematic study what it takes to prevent malicious KGC from decrypting ciphertext encrypted for an honest user, which covers case certificateless encryption, shows impossibility ideal escrow-free IBE, unless there uncertainty in identity. Our also explains underpinning idea anonymous indistinguishability (ACI), formalized Chow PKC 2009. An ACI-secure IBE (or logical entity get holds key, such as collusion number authorities holding sufficient secret's shares) if does not know intended recipient ciphertext, guarantee that none existing attempts literature provide. The notion ACI crucially relies on privacy identity eyes KGC. only leakage allowed Chow's model via querying embedded-identity oracle. In this paper, we strengthen his allow arbitrary bounded recipient's We give generic construction how achieve when has enough entropy.
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