منابع مشابه
Generic Conversions from CPA to CCA secure Functional Encryption
In 2004, Canetti-Halevi-Katz and later Boneh-Katz showed generic CCA-secure PKE constructions from a CPA-secure IBE. Goyal et al. in 2006 further extended the aforementioned idea implicitly to provide a specific CCA-secure KP-ABE with policies represented by monotone access trees. Later, Yamada et al. in 2011 generalized the CPA to CCA conversion to all those ABE, where the policies are represe...
متن کاملLecture 5 , CPA Secure Encryption from PRFs
Ralling: CPA Security and Randomized Encryption. Last time, we discussed CPA Security and how it allows more power to the adversary compared to the “single-message” indistinguishability-based definitions. The security goal here is that, as long as the adversary is computationally bounded (to polynomial time computation), they cannot guess the message that is being encrypted. More formally, our ...
متن کاملEfficient Compilers for After-the-Fact Leakage: From CPA to CCA-2 Secure PKE to AKE
The goal of leakage-resilient cryptography is to construct cryptographic algorithms that are secure even if the adversary obtains side-channel information from the real world implementation of these algorithms. Most of the prior works on leakage-resilient cryptography consider leakage models where the adversary has access to the leakage oracle before the challenge-ciphertext is generated (befor...
متن کاملCPA Security and Limitations
Consider Pr [ A( ,Uk,·) ( 1, E ( 1,Uk,m k )) = 1 ] for b = 0, 1 (we will refer to this as Pr [A0] and Pr [A1] for convenience). Suppose that the oracle is queried at most p (k) times for some polynomial p (k). The i-th time the oracle is queried, it picks some random c0 (call it ci,0) and then returns ci,0,Uk (ci,0) ⊕m. Let E be the event that ci,0 = c 0 for any i. Since each ci,0 is chosen at ...
متن کاملCovering Property Axiom CPA
Draft of March 11, 2001. We still plan to make considerable changes to this manuscript. Comments and list of typos are welcome!
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ژورنال
عنوان ژورنال: TRENDS IN THE SCIENCES
سال: 2003
ISSN: 1884-7080,1342-3363
DOI: 10.5363/tits.8.3_58