The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Nous présentons un schéma de chiffrement à clé publique (PKE) sécurisé sans mise à jour de clé, c'est-à-dire que les clés publiques et privées sont immuables. En revanche, les schémas PKE de sécurité transmise antérieurs assurent une sécurité transmise en mettant constamment à jour les clés secrètes. Notre schéma est basé sur le cryptage des témoins par Garg et al. (STOC 2013) et une blockchain de preuve de participation avec la propriété de fork distinctive introduite par Goyal et al. (TCC 2017), et garantit qu'un texte chiffré ne peut pas être déchiffré plus d'une fois, rendant ainsi une clé secrète compromise inutile en ce qui concerne le déchiffrement du texte chiffré passé que l'utilisateur légitime a déjà déchiffré. Dans ce travail, nous formalisons la notion de PKE sécurisé vers l'avant basé sur la blockchain, montrons la faisabilité de construire un schéma PKE sécurisé sans mise à jour de clé et discutons des propriétés intéressantes de notre schéma telles que la sécurité post-compromis.
Seiya NUTA
University of Tsukuba
Jacob C. N. SCHULDT
National Institute of Advanced Industrial Science and Technology
Takashi NISHIDE
University of Tsukuba
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Seiya NUTA, Jacob C. N. SCHULDT, Takashi NISHIDE, "PoS Blockchain-Based Forward-Secure Public Key Encryption with Immutable Keys and Post-Compromise Security Guarantees" in IEICE TRANSACTIONS on Fundamentals,
vol. E106-A, no. 3, pp. 212-227, March 2023, doi: 10.1587/transfun.2022CIP0016.
Abstract: We present a forward-secure public-key encryption (PKE) scheme without key update, i.e. both public and private keys are immutable. In contrast, prior forward-secure PKE schemes achieve forward security by constantly updating the secret keys. Our scheme is based on witness encryption by Garg et al. (STOC 2013) and a proof-of-stake blockchain with the distinguishable forking property introduced by Goyal et al. (TCC 2017), and ensures a ciphertext cannot be decrypted more than once, thereby rendering a compromised secret key useless with respect to decryption of past ciphertext the legitimate user has already decrypted. In this work, we formalize the notion of blockchain-based forward-secure PKE, show the feasibility of constructing a forward-secure PKE scheme without key update, and discuss interesting properties of our scheme such as post-compromise security.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/transfun.2022CIP0016/_p
Copier
@ARTICLE{e106-a_3_212,
author={Seiya NUTA, Jacob C. N. SCHULDT, Takashi NISHIDE, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={PoS Blockchain-Based Forward-Secure Public Key Encryption with Immutable Keys and Post-Compromise Security Guarantees},
year={2023},
volume={E106-A},
number={3},
pages={212-227},
abstract={We present a forward-secure public-key encryption (PKE) scheme without key update, i.e. both public and private keys are immutable. In contrast, prior forward-secure PKE schemes achieve forward security by constantly updating the secret keys. Our scheme is based on witness encryption by Garg et al. (STOC 2013) and a proof-of-stake blockchain with the distinguishable forking property introduced by Goyal et al. (TCC 2017), and ensures a ciphertext cannot be decrypted more than once, thereby rendering a compromised secret key useless with respect to decryption of past ciphertext the legitimate user has already decrypted. In this work, we formalize the notion of blockchain-based forward-secure PKE, show the feasibility of constructing a forward-secure PKE scheme without key update, and discuss interesting properties of our scheme such as post-compromise security.},
keywords={},
doi={10.1587/transfun.2022CIP0016},
ISSN={1745-1337},
month={March},}
Copier
TY - JOUR
TI - PoS Blockchain-Based Forward-Secure Public Key Encryption with Immutable Keys and Post-Compromise Security Guarantees
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 212
EP - 227
AU - Seiya NUTA
AU - Jacob C. N. SCHULDT
AU - Takashi NISHIDE
PY - 2023
DO - 10.1587/transfun.2022CIP0016
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E106-A
IS - 3
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - March 2023
AB - We present a forward-secure public-key encryption (PKE) scheme without key update, i.e. both public and private keys are immutable. In contrast, prior forward-secure PKE schemes achieve forward security by constantly updating the secret keys. Our scheme is based on witness encryption by Garg et al. (STOC 2013) and a proof-of-stake blockchain with the distinguishable forking property introduced by Goyal et al. (TCC 2017), and ensures a ciphertext cannot be decrypted more than once, thereby rendering a compromised secret key useless with respect to decryption of past ciphertext the legitimate user has already decrypted. In this work, we formalize the notion of blockchain-based forward-secure PKE, show the feasibility of constructing a forward-secure PKE scheme without key update, and discuss interesting properties of our scheme such as post-compromise security.
ER -