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A New Public Key Cryptosystem Based on Edwards Curves
Elliptic curves Twisted Edwards curves RSA cryptosystem
2019/9/19
The elliptic curve cryptography plays a central role in various cryptographic schemes and protocols. For efficiency reasons, Edwards curves and twisted Edwards curves have been introduced. In this pap...
Simple and Efficient KDM-CCA Secure Public Key Encryption
key dependent message security chosen ciphertext security
2019/9/16
We propose two efficient public key encryption (PKE) schemes satisfying key dependent message security against chosen ciphertext attacks (KDM-CCA security). The first one is KDM-CCA secure with respec...
Structure-Preserving and Re-randomizable RCCA-secure Public Key Encryption and its Applications
public-key cryptography Rand-RCCA PKE
2019/8/22
Re-randomizable RCCA-secure public key encryption (Rand-RCCA PKE) schemes reconcile the property of re-randomizability of the ciphertexts with the need of security against chosen-ciphertexts attacks.
Towards a Hybrid Public Key Infrastructure (PKI): A Review
Certificate-based PKI Identity-based public key cryptography (ID-PKC) Hybrid PKI
2019/7/15
Traditional Certificate-based public key infrastructure (PKI) suffers from the problem of certificate overhead like its storage, verification, revocation etc. To overcome these problems, the idea of c...
DDH-based Multisignatures with Public Key Aggregation
Multisignatures Decisional Diffie-Hellman assumption Blockchain
2019/7/8
A multisignature scheme allows a group of signers to produce a joint signature on a common message, which is more compact than a collection of distinct signatures from all signers. Given this signatur...
Public-Key Function-Private Hidden Vector Encryption (and More)
function privacy obfuscation conjunctions
2019/6/26
Conjunctions. If the predicate computes a conjunction, our construction is a public-key function-private hidden vector encryption scheme. This addresses an open problem posed by Boneh, Raghunathan, an...
Homomorphism learning problems and its applications to public-key cryptography
Learning With Errors isogenies non-commutative cryptography
2019/6/19
We present a framework for the study of a learning problem over abstract groups, and introduce a new technique which allows for public-key encryption using generic groups. We proved, however, that in ...
Public-Key Cryptography in the Fine-Grained Setting
Fine-grained Public-Key One-Way-Function
2019/6/4
Cryptography is largely based on unproven assumptions, which, while believable, might fail. Notably if P=NPP=NP, or if we live in Pessiland, then all current cryptographic assumptions will be broken. ...
A software watermarking scheme enables users to embed a message or mark within a program while preserving its functionality. Moreover, it is difficult for an adversary to remove a watermark from a mar...
Non-malleability for quantum public-key encryption
public-key cryptography non-malleability quantum cryptography
2019/5/21
Non-malleability is an important security property for public-key encryption (PKE). Its significance is due to the fundamental unachievability of integrity and authenticity guarantees in this setting,...
Dual Isogenies and Their Application to Public-key Compression for Isogeny-based Cryptography
Post-quantum cryptography public-key compression supersingular elliptic curves
2019/5/21
The isogeny-based protocols SIDH and SIKE have received much attention for being post-quantum key agreement candidates that retain relatively small keys. A recent line of work has proposed and further...
Revisiting Privacy-aware Blockchain Public Key Infrastructure
Blockchain Public Key Infrastructure Privacy
2019/5/21
Privacy-aware Blockchain Public Key Infrastructure (PB- PKI) is a recent proposal by Louise Axon (2017) to create a privacy-preserving Public Key Infrastructure on the Blockchain. However, PB-PKI suff...
Revisiting Privacy-aware Blockchain Public Key Infrastructure
Blockchain Public Key Infrastructure Privacy
2019/5/21
Privacy-aware Blockchain Public Key Infrastructure (PB- PKI) is a recent proposal by Louise Axon (2017) to create a privacy-preserving Public Key Infrastructure on the Blockchain. However, PB-PKI suff...
Achieving secure and efficient lattice-based public-key encryption: the impact of the secret-key distribution
Lattice cryptography Public-key encryption Noisy ElGamal
2019/4/22
Lattice-based public-key encryption has a large number of design choices that can be combined in diverse ways to obtain different tradeoffs. One of these choices is the distribution from which secret ...
Indifferentiability for Public Key Cryptosystems
Indifferentiability Composition Public key encryption Random oracle model
2019/4/11
We initiate the study of indifferentiability for public key encryption and other public key primitives. Our main results are definitions and constructions of public key cryptosystems that are indiffer...