Forward-Secure Public Key Encryption Without Key Update from Proof-of-Stake Blockchain

Nuta, Seiya; Schuldt, Jacob C. N.; Nishide, Takashi

doi:10.1007/978-3-030-92518-5_20

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…Compared to the INDOCRYPT2021 version [21], we added a more concrete discussion on post-compromise security (Section 5), a supplementary explanation for the extractability of witness encryption (Appendix A), an explanation of why the correctness does not hold if the unique (instead of first) blockchain record is used as a witness (Section 3.4), and another mitigation against a message suppression attack from key compromise detection (Section 6.4).…”

Section: Updates From Indocrypt Versionmentioning

confidence: 99%

PoS Blockchain-Based Forward-Secure Public Key Encryption with Immutable Keys and Post-Compromise Security Guarantees

Nuta

Schuldt

Nishide

2023

IEICE Trans. Fundamentals

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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 forwardsecure 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.

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Section: Updates From Indocrypt Versionmentioning

confidence: 99%

PoS Blockchain-Based Forward-Secure Public Key Encryption with Immutable Keys and Post-Compromise Security Guarantees

Nuta

Schuldt

Nishide

2023

IEICE Trans. Fundamentals

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“…Consequently, sensitive information or data will be more secure [28,29]. To establish trust, the blockchain employs cryptography [30,31]. Cryptography is used to store information on the blockchin on the ledger.…”

Section: Fig 2 Block Chain Implementationmentioning

confidence: 99%

Cyber Security for Medical Image Encryption using Circular Blockchain Technology Based on Modify DES Algorithm

Jamil

Rahma

2023

Int. J. Onl. Eng.

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Recently, with the requirement for protecting the privacy of images transferred over the internet and media networks. The need to protect these images from hacking by unauthorized persons and from the manipulation of these images has become very important in this research, Block chain technology was used for its importance in cybersecurity. To maintain the confidentiality of the patient's medical data, as a result, to solve this problem requires increasing the strength of the key used in the encryption process, which is responsible for ensuring the security of the image .In this paper, it is proposed to use block chain technology with the Data Encryption Standard (DES) algorithm for the purpose of increasing the degree of security of the transmitted images by enhancing the key during the process of encrypting the transmitted images as well as increasing the degree of authentication between the sender and receiver. Experimental outcomes manifested that the security of encryption image that gained via the suggested algorithm is higher, performing the goal of protecting the information of medical image, as presented by the results obtained in Entropy, MSE, and PSNR.

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Forward-Secure Public Key Encryption Without Key Update from Proof-of-Stake Blockchain

Cited by 2 publications

References 19 publications

PoS Blockchain-Based Forward-Secure Public Key Encryption with Immutable Keys and Post-Compromise Security Guarantees

PoS Blockchain-Based Forward-Secure Public Key Encryption with Immutable Keys and Post-Compromise Security Guarantees

Cyber Security for Medical Image Encryption using Circular Blockchain Technology Based on Modify DES Algorithm

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