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
Apresentamos um esquema de criptografia de chave pública (PKE) seguro sem atualização de chave, ou seja, tanto as chaves públicas quanto as privadas são imutáveis. Em contraste, os esquemas anteriores de PKE com segurança direta alcançam segurança direta atualizando constantemente as chaves secretas. Nosso esquema é baseado na criptografia de testemunhas de Garg et al. (STOC 2013) e uma blockchain de prova de participação com a propriedade de bifurcação distinguível introduzida por Goyal et al. (TCC 2017) e garante que um texto cifrado não possa ser descriptografado mais de uma vez, tornando assim uma chave secreta comprometida inútil em relação à descriptografia de texto cifrado anterior que o usuário legítimo já descriptografou. Neste trabalho, formalizamos a noção de PKE forward-secure baseado em blockchain, mostramos a viabilidade de construir um esquema de PKE forward-secure sem atualização de chave e discutimos propriedades interessantes de nosso esquema, como segurança pós-comprometimento.
Seiya NUTA
University of Tsukuba
Jacob C. N. SCHULDT
National Institute of Advanced Industrial Science and Technology
Takashi NISHIDE
University of Tsukuba
The copyright of the original papers published on this site belongs to IEICE. Unauthorized use of the original or translated papers is prohibited. See IEICE Provisions on Copyright for details.
Copiar
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
Copiar
@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},}
Copiar
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 -