[PDF] Top 20 A Punctured Programming Approach to Adaptively Secure Functional Encryption

... achieve functional encryption for as expressive functionality classes as pos- sible — ideally one would like to achieve it for any poly-time computable ...a functional encryption system for ... See full document

... system encryption scheme is constructed so that an adversary cannot distinguish the distribution of normal keys (or ciphertexts) from special “semi-functional” keys (or ...semi- functional keys are ... See full document

... system encryption methodology for building adaptively secure predicate ...system encryption scheme, there are two types of keys and ciphertexts: normal and ...system encryption ... See full document

... update approach that roughly works as follows: The encryptor will encrypt a plaintext with an attribute set Γ as usual, and in addition, it also specifies the time slot attribute for which the ciphertext can be ... See full document

... Our approach. We follow the high level idea of Hemenway et al. [HJO + 16] in encrypting the garbled circuit using a somewhere equivocal encryption but employ a crucial trick to minimize the number of ... See full document

... different approach to obtain MBPs for Boolean formulas that avoids the complexity of Barrington’s ...Our approach follows the general method of computing automata with generalized MBPs, but we observe that ... See full document

... selectively secure – that is, they have been proved secure only in a weaker model in which the adversary is required to specify the message m for its challenge ciphertext before it sees the public ... See full document

... of functional encryption have been first realized for selective adversaries [12, 56, 41, 43, 32] before being upgraded to attain full ...building adaptively secure functional ... See full document

... of functional encryption, and has great potential in going from selective to adaptive security of encryption ...hybrid functional encryption should lead to a selective-to-adaptive ... See full document

... therefore, if y · v i = 0, secret share ξs i for central secret ξs 0 is obtained, and if y · v i = 0, s i is totally hidden from the decryptor since θ i is freshly random. New Proof Techniques: Partial LSS randomization ... See full document

... to functional encryption, obtaining adaptively secure public-key functional encryption from adaptively secure single-ciphertext secret key functional ... See full document

... key-homomorphic functional encryption scheme from which they borrow, are only secure in the selective security model, where the adversary must announce ahead of time the message whose signature it ... See full document

... Our assumptions and CRIND-Security. For these reasons, we need to extend the notion of MI-FE to what we call collision-resistant indistinguishability (CRIND, in short) 4 . In Section 4 we provide an instantiation of this ... See full document

... to adaptively corrupt users is that we must ensure that the adversary cannot trivially win the security ...Our approach is similar in spirit: the security game maintains a “recoding graph” that has n nodes, ... See full document

... an adaptively indistinguishable garbling scheme for all circuits whose online complexity does not depend on output-length of the circuit to ...Our adaptively indistinguishable garbling scheme for all ... See full document

... In the experiments, the original images and its corresponding encrypted images are shown in figure 3, and their histograms are shown in figure 5. It is clear that the histogram of the encrypted image is nearly uniformly ... See full document

... Between a number of online service providers for computing and data hosting the cloud becomes most popular service now in these days. A significant amount of users believe in cloud due to their performance and ... See full document

... We do not believe these are major problems for either work. In both cases, alternative ways to establish the the authors’ main results already existed. Goyal, Ishai, Sahai, Venkatesan and Wadia [18] present an ... See full document

... In the standard model, there are very few CCA-secure ABE schemes which are either directly constructed or from CPA-secure ABE by applying the ab- straction of [20]. The intuition in [20] basically extended ... See full document

... only secure against passive ...(i) secure under adaptive corruptions in the standard model under a well-studied assumption; (ii) robust against malicious adversaries; (iii) non-interactive ... See full document