Titlebook: Selected Areas in Cryptography; 27th International C Orr Dunkelman,Michael J. Jacobson, Jr.,Colin O‘Fly Conference proceedings 2021 Springe

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0302-9743 ions, MAC algorithms, and authenticated encryption schemes, efficient implementations of symmetric and public key algorithms, mathematical and algorithmic aspects of applied cryptology, and secure elections and related cryptographic constructions.978-3-030-81651-3978-3-030-81652-0Series ISSN 0302-9743 Series E-ISSN 1611-3349

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Not Enough LESS: An Improved Algorithm for Solving Code Equivalence Problems over and 2 s respectively on an Intel i5-8400H CPU. Since the field size for LESS-II is relatively small . our algorithm does not improve on existing methods. Nonetheless, we estimate that LESS-II can be broken with approximately . row operations.

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Efficient Lattice-Based Polynomial Evaluation and Batch ZK Argumentshe polynomial argument as a building block. Our contribution is motivated by the discrete log based construction (EUROCRYPT’16), where in our case we employ different techniques to obtain a communication efficient lattice-based scheme. In the zero-knowledge polynomial batch-protocol, we prove the kn

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FROST: Flexible Round-Optimized Schnorr Threshold Signaturesmmon private key. Consequently, generating signatures in a threshold setting imposes overhead due to network rounds among signers, proving costly when secret shares are stored on network-limited devices or when coordination occurs over unreliable networks. In this work, we present FROST, a Flexible

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Obfuscating Finite Automataby extending an existing matrix fully homomorphic encryption scheme. Using obfuscated deterministic finite automata we can for example evaluate secret . or disjunctive normal forms on public inputs. In particular, the possibility of evaluating regular expressions solves the open problem of ..