@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}
}