Public-Key Cryptography – PKC 2021

Cryptographic Primitives and Schemes.- More Efficient Digital Signatures with Tight Multi-User Security.- Multiparty Cardinality Testing for Threshold Private Set Intersection.- Verifiable Random Functions with Optimal Tightness.- A Geometric Approach to Homomorphic Secret Sharing.- Generic Negation of Pair Encodings.- On Selective-Opening Security of Deterministic Primitives.- Revisiting (R)CCA Security and Replay Protection.- Cryptographic Protocols.- Single-to-Multi-Theorem Transformations for Non-Interactive Statistical Zero-Knowledge.- On the CCA Compatibility of Public-Key Infrastructure.- Round-optimal Verifiable Oblivious Pseudorandom Functions from Ideal Lattices.- BETA: Biometric-Enabled Threshold Authentication.- Masked Triples: Amortizing Multiplication Triples across Conditionals.- Multi-Party Threshold Private Set Intersection with Sublinear Communication.- On the (In)Security of the Di e-Hellman Oblivious PRF with Multiplicative Blinding.- An Efficient and Generic Construction for Signal's Handshake (X3DH): Post-Quantum, State Leakage Secure, and Deniable.- Cryptographic Pseudorandom Generators Can Make Cryptosystems Problematic.- Publicly Verifiable Zero Knowledge from (Collapsing) Blockchains.- Two-server Distributed ORAM with Sublinear Computation and Constant Rounds.- Flexible and Efficient Verifiable Computation on Encrypted Data.- Transferable E-cash: A Cleaner Model and the First Practical Instantiation.- Private Set Operations from Oblivious Switching.- On Publicly-Accountable Zero-Knowledge and Small Shuffle Arguments.- Beyond Security and E ciency: On-Demand Ratcheting with Security Awareness.- Group Encryption: Full Dynamicity, Message Filtering and Code-Based Instantiation.- Steel: Composable Hardware-based Stateful and Randomised Functional Encryption.- Attacks and Cryptanalysis.- Adventures in Crypto Dark Matter: Attacks and Fixes for Weak Pseudorandom Functions.