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The five-volume set LNCS 15674-15678 constitutes the refereed proceedings of the 28th IACR International Conference on Practice and Theory of Public Key Cryptography, PKC 2025, held in Røros, Norway, during May 12-15, 2025.The 60 papers included in these proceedings were carefully reviewed and selected from 199 submissions. They are grouped into these topical sections: MPC and friends; advanced PKE; security of post-quantum signatures; proofs and arguments; multi-signatures; protocols; foundations of lattices and LPN; threshold signatures; isogenies and group actions; secure computation; security against real-world attacks; batch arguments and decentralized encryption; and cryptography for blockchains.
Advanced PKE: Tight Adaptive Simulation Security for Identity-based Inner-Product FE in the (Quantum) Random Oracle Model.- Predicate Encryption from Lattices: Enhanced Compactness and Refined Functionality.- Multi-Client Functional Encryption with Public Inputs and Strong Security.- Key Revocation in Registered Attribute-Based Encryption. Threshold Signatures: BUFFing Threshold Signature Schemes.- Finally! A Compact Lattice-Based Threshold Signature.- Commit-and-Prove System for Vectors and Applications to Threshold Signing.- Dazzle: Improved Adaptive Threshold Signatures from DDH. Isogenies and Group Actions: Radical 2-isogenies and cryptographic hash functions in dimensions 1, 2 and 3.- PRISM: Simple And Compact Identification and Signatures From Large Prime Degree Isogenies.- Faster SCALLOP from Non-Prime Conductor Suborders in Medium Sized Quadratic Fields.- Multiple Group Action Dlogs with(out) Precomputation.
