A Strengthened Security Notion for Password-Protected Secret Sharing Schemes
Shingo Hasegawa, Shuji Isobe, Junya Iwazaki, Eisuke Koizumi, Hiroki Shizuya · IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences · 2015
Password-protected secret sharing (PPSS, for short) schemes were proposed by Bagherzandi, Jarecki, Saxena and Lu. In this paper, we consider another attack for PPSS schemes which is based on public parameters and documents. We show that the protocol proposed by Bagherzandi et al. is broken with the attack. We then propose an enhanced protocol which is secure against the attack.