A Strengthened Security Notion for Password-Protected Secret Sharing Schemes

Shingo HASEGAWA; Shuji ISOBE; Jun-ya IWAZAKI; Eisuke KOIZUMI; Hiroki SHIZUYA

doi:10.1587/transfun.E98.A.203

Special Section on Cryptography and Information Security

A Strengthened Security Notion for Password-Protected Secret Sharing Schemes

Shingo HASEGAWA, Shuji ISOBE, Jun-ya IWAZAKI, Eisuke KOIZUMI, Hiroki SHIZUYA

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Keywords: password-protected secret sharing, twin ElGamal encryption, simulation-sound non-interactive zero-knowledge

JOURNAL RESTRICTED ACCESS

2015 Volume E98.A Issue 1 Pages 203-212

DOI https://doi.org/10.1587/transfun.E98.A.203

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Abstract

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.

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