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Time reveals the truth : more efficient constructions of timed cryptographic primitives / Peter Chvojka. Wuppertal, March 25, 2021
Content
Abstract
Introduction
Publication Overview
Preliminaries
Notation
NP Language
Cryptographic Primitives
One-Time Signatures
Public-Key Encryption
Homomorphic Encryption
Tag-Based Encryption
Functional Encryption
Obfuscation
Randomized Encoding
Bilinear Groups
Assumptions
The Random Oracle Model
The Strong Algebraic Group Model
(Extractable) Offline Witness Encryption
Introduction, Contributions and Related Work
Definitions of (Extractable) Offline Witness Encryption
Puncturable Tag-Based Encryption
Offline Time-Lock Encryption
Constructions
Construction of OWE
Construction of EOWE
Instantiation of Puncturable Encryption Scheme
PE from Kiltz's Tag-Based Encryption Scheme
Conclusion and Open Problems
Encryption Schemes from Time-Lock Puzzles
Introduction, Contributions and Related Work
Time Lock-Puzzles
Instantiating TLPs from Sequential Squaring
Instantiating TLPs from Randomized Encodings
Sequential Time-Lock Puzzles
Instantiating Sequential TLPs from Sequential Squaring
Hardness of the Gap Sequential Squaring Assumption
(Sequential) Timed-Release Encryption
Basic TRE Construction
Sequential TRE
Properties of TRE Construction
Integrating Timed-Release Features into Functional Encryption
Applications
Timed Public-Key Encryption
Weak IND-CCA-secure TPKE
Generic Construction of IND-CCA-secure TPKE
Construction of IND-CCA-secure TPKE from SSSA
Conclusion and Open Problems
Bibliography