@Article{cmc.2020.011293, AUTHOR = {Gyeong-Jin Ra, Chang-Hyun Roh, Im-Yeong Lee, *}, TITLE = {A Key Recovery System Based on Password-Protected Secret Sharing in a Permissioned Blockchain}, JOURNAL = {Computers, Materials \& Continua}, VOLUME = {65}, YEAR = {2020}, NUMBER = {1}, PAGES = {153--170}, URL = {http://www.techscience.com/cmc/v65n1/39559}, ISSN = {1546-2226}, ABSTRACT = {In today’s fourth industrial revolution, various blockchain technologies are being actively researched. A blockchain is a peer-to-peer data-sharing structure lacking central control. If a user wishes to access stored data, she/he must employ a private key to prove ownership of the data and create a transaction. If the private key is lost, blockchain data cannot be accessed. To solve such a problem, public blockchain users can recover the key using a wallet program. However, key recovery in a permissioned blockchain (PBC) has been but little studied. The PBC server is Honest-but-Curious (HBC), and should not be able to learn anything of the user; the server should simply recover and store the key. The server must also be resistant to malicious attacks. Therefore, key recovery in a PBC must satisfy various security requirements. Here, we present a password-protected secret sharing (PPSS) key recovery system, protected by a secure password from a malicious key storage server of a PBC. We describe existing key recovery schemes and our PPSS scheme.}, DOI = {10.32604/cmc.2020.011293} }