[PDF] Top 20 Statistical Witness Indistinguishability (and more) in Two Messages

... achieving two-message statistical WI has been proving ...to two-message WI requires the un- derlying NIZK to be a proof system – that is, for the NIZK to be sound against computationally unbounded ... See full document

... If we used VBB obfuscation, we could argue security intuitively as follows. Imagine an aug- mented version of the underlying MPC protocol, where we prepend a round of commitment to the inputs and randomness, after which ... See full document

... to construct many powerful primitives such as public-key encryption, identity-based encryption, attribute- based encryption (via witness encryption), as well as NIZKs, CCA encryption, deniable encryption [12], and ... See full document

... these two cases, as the latter allows A to establish entanglement of the message(s) with other ...challenge messages for the IND game models the worst case that might happen: A knows that the ciphertext he ... See full document

... The basic model of execution. Following [GMR89,Gol01], a protocol is represented as an interactive Turing machine (ITM), which represents the program to be run within each par- ticipant. Specifically, an ITM has three ... See full document

... preserves two of the guarantees of the invariant signatures: 1) it is invariant in the sense that for every verification key VK and message M , C = VK(M ) can be opened to a unique bit b, due to the binding of the ... See full document

... The protocol and techniques. Before presenting the protocol, let us recall the definition of adaptive security. Security requires existence of a simulator that has access only to the trusted party for the function, and ... See full document

... normal indistinguishability under chosen plaintext attack (IND-CPA) security notion, in ER-IND-CPA the adversary should not be able to distinguish between the encryption of two messages that compress ... See full document

... also witness indistinguishable (WI), without blowing up the communication com- ...achieve statistical witness indistinguishability using the results and techniques of ... See full document

... A partially ordered set (poset) is a pair (V, ≤) where V is a finite set of pairwise dis- joint classes, called security classes, and ‘≤’ is a partial order on V , i.e. is a reflexive, antisymmetric, and transitive ... See full document

... reduce two-stage games (such as UCEs) to a “one-stage assumption” such as ...inherently two-stage and, thus, allow us to circumvent Wichs’ impossibility ... See full document

... mail messages between ...requiring two different services and two different protocols for sending messages and receiving messages as current e-mail standard do (for example, SMTP for ... See full document

... child is asked to appear in family court, the pediatri- cian can provide counseling to help prepare the child for the court appearance.. If sexual abuse is suspected, the case will invol[r] ... See full document

... “fact”) witness and an expert witness is that experts can offer opinions beyond the facts of what they have personally ...fact witness would preclude asking a “why” question or departing at all from  ... See full document

... any indistinguishability obfuscator can be converted into one where the size of obfuscated circuits is twice that of the original circuit plus an additive overhead that is polynomial in its depth, input length, ... See full document

... A hearing of the same or a different proceeding provides an op- portunity to perpetuate the witness's testimony for admission into evidence as former testimony und[r] ... See full document

... Our contribution. We introduce the concept of recongurable cryptography. For this purpose, it is necessary to give a security denition for a cryptographic scheme dened in two security parameters. This denition ... See full document

... The operational needs of the justice systems demand that investigations and litigation are efficient. This includes ensuring that the testimony that witnesses are expected to give at court is recorded and packaged so ... See full document

... Although witness of woman is limited, but woman expertise in all economic, scientific fields is ...of witness are report from sense and feeling, and criteria is scientific and mental guess, according to ... See full document

... of messages that are needed for a checkpoint coordination as like ...three messages per process (request message, reply message, final decision message) for coordinating the checkpoint ...only two ... See full document