eurocrypt 2020 program

prior ones, in particular by using exponentially less quantum memory Call for papers Paper submission Invited talks Accepted papers Main program Rump session Rump session program Affiliated events. Our provable-security results are quantitative, and we discuss the practical implications for iMessage.We present the first maliciously secure protocol for succinct non-interactive secure two-party computation (SNISC): Each player sends just a single message whose length is (essentially) independent of the running time of the function to be computed. Second, our observation suggests that differential trail search should not stop with probability $2^{-n/2}$ but should consider up to $2^{-2n/3}$. In this work we study a different, less investigated OR-proof technique, highlighted by Abe, Ohkubo, and Suzuki (ASIACRYPT'02). Code-based cryptography is the area of research that focuses on the study of cryptosystems based on error-correcting codes, following the seminal work of McEliece and Niederreiter in the late 1970s - … proposed in 2007 an acceleration of the key-recovery part of Algorithm 2 for last-round attacks based on the FFT. For instance, More concretely, for a secret sharing scheme with $p$-bit long shares, $\ell$-bit leakage per share, where $\widehat{t}$ shares uniquely define the remaining $n - \widehat{t}$ shares, it has to hold that $p \ge \frac{\ell (n - t)}{\widehat{t}}$. The adversary's goal is to distinguish between these two cases. This makes progress towards proving a Our approach is heuristic in the sense that our construction is not provably secure and makes implicit assumptions about the interplay between these underlying primitives. Previously such results either relied on algebraic assumptions or required subexponential security assumptions.An adversary with $S$ bits of

- a solution to an instance of the Permuted Kernel Problem and First, there seems to exist a common belief that classically secure hash functions will remain secure against quantum adversaries. non-quantum) simulator, run experiments for a wide range of parameters
However, choosing rounds that are so different from each other is very rarely done, as it makes security analysis and implementation much harder. the time complexity, and exponentially in the space complexity. Our idea, in a nutshell, is to replace this decomposition by an integral one. Moreover, the middle round attacks are entirely blind in the sense that no access to the ciphertexts (correct/faulty) or plaintexts are required. Despite its practical relevance, its security analysis is unsatisfactory. communication. For threshold-BBSS we also achieve minimal expansion factor $O(\log n)$. In this work, we study leakage-resilient secret sharing schemes and prove a lower bound on the share size and the required amount randomness of any information-theoretically secure scheme. Test-of-Time award can be found in the Hence, the area size increases proportionally to the number of shares. In particular, it bypasses a previous `impossibility result' of Jiang, Zhang and Ma [IACR eprint 2019]. In another front, we comprehensively study the problem of {\em Somewhere-Extraction} from a {\em weak} source, resulting in a series of bounds. A relevant freedom in the design space is to allow for a highly non-uniform distribution of S-Boxes. We believe the security of NLinFE stands on significantly firmer footing as a result of this work.In recent years, there has been exciting progress on building two-source extractors for sources with low min-entropy. By the same analogy, generic quantum algorithms such as the BHT algorithm find collisions with complexity $O(2^{n/3})$. In order to balance concerns of both randomness failures and the threat of fault injection, some signature designs are advocating a ``hedged'' derivation of the per-signature randomness, by hashing the secret key, message, and a nonce. -- Statistical Zaps: We give the first construction of statistical Zaps, namely, two-round statistical witness-indistinguishable (WI) protocols with a public-coin verifier. We experimentally validate our methodology, demonstrating feasibility in practice.In this paper we spot light on dedicated quantum collision attacks on concrete hash functions, which has not received much attention so far. Our methodology does not rely on any special algebraic objects and, moreover, achieves new desirable properties: it is post-quantum and it is transparent (the setup is public coin).

Here, "must know" means that a suitable extractor can extract such All the speakers will be panelists during the rump session and are required to use their real names.
memory obtains a stream of $Q$ elements that are uniformly drawn from the set $\{1,2,\ldots,N\}$, either with or without replacement.

Eurocrypt 2020. This is the first polynomial time algorithm to compute the number of DBCs for positive integers.

May 11-15 2020 Virtual conference.

Our bounds highlight the fact that, in most regimes of parameters (including those relevant for applications), {\em SHELA} sources significantly outperform {\em weak} sources of comparable parameters both when it comes to the process of {\em Somewhere-Extraction}, or in the task of amplification of success probability in randomized algorithms.

* With Auxiliary Information: We construct secure extractors in this setting, as long as both the source and the distinguisher are computationally bounded. We establish the lower bound by studying the hardness of a related computational problem which we call the search-by-hypersurface problem.Oblivious RAM (ORAM), first introduced in the ground-breaking work of Goldreich and Ostrovsky (STOC '87 and J. ACM '96) is a technique for provably obfuscating programs' access patterns, such that the access patterns leak no information about the programs' secret inputs. For quantum computation, on the other hand, protocols allowing arbitrary dishonest majority have only been proven for k=2. Papers from EUROCRYPT 2020. We introduce {\em SHELA} (Somewhere Honest Entropic Look Ahead) sources to model this situation.

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