Paper 2023/990
Privacy Preserving Records Sharing using Blockchain and Format Preserving Encryption
, Robert Bosch (India)Abstract
Healthcare providers cannot share their patients' encrypted data among themselves because of interoperability issues. Many blockchain- based solutions have been proposed to allow for sharing medical data in a privacy-preserving manner, but interoperability problems persist. In this paper, we present a protocol called Blockchain-Format Preserving Encryption (B-FPE) to preserve patients' data privacy. Each patient is provided with an FPE key at the time of registration. All medical records are encrypted with the FPE key and stored in the blockchain. All the blockchain transactions are signed using group signatures. We use group signatures for signing the transactions to maintain the anonymity of healthcare providers. The new encrypted data block is concatenated to the blockchain. We present two cases: The regular phase, in which a patient is in a conscious state to share their FPE key with the healthcare provider, and the Emergency phase, in which a patient is not in a conscious state to share their key with the healthcare provider. In the latter case, the healthcare provider reconstructs the FPE key and decrypts the ciphertext. We assume this decryption happens in an oblivious manner.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Preprint.
- Keywords
- Format Preserving EncryptionBlockchainGroup SignaturesSecret SharingMedical RecordsPrivacySecurity
- Contact author(s)
-
sandel2001 @ gmail com
vishal saraswat @ gmail com - History
- 2023-06-26: approved
- 2023-06-25: received
- See all versions
- Short URL
- https://ia.cr/2023/990
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2023/990,
author = {Sai Sandilya Konduru and Vishal Saraswat},
title = {Privacy Preserving Records Sharing using Blockchain and Format Preserving Encryption},
howpublished = {Cryptology ePrint Archive, Paper 2023/990},
year = {2023},
note = {\url{https://eprint.iacr.org/2023/990}},
url = {https://eprint.iacr.org/2023/990}
}
