[Resource Topic] 2016/512: Security Analysis of ePrint Report 2016/500 "Efficient Identity-Based Encryption and Public-Key Signature from Trapdoor Subgroups"

Resource Public-key cryptography
#1

Welcome to the resource topic for 2016/512

Title:
Security Analysis of ePrint Report 2016/500 “Efficient Identity-Based Encryption and Public-Key Signature from Trapdoor Subgroups”

Authors: Lucjan Hanzlik, Kamil Kluczniak

Abstract:

In this short report we analyse the security of three schemes proposed by J. H. Park et al. in “Efficient Identity-Based Encryption and Public-Key Signature from Trapdoor Subgroups”. The schemes make use of trapdoor subgroups of \ZZ_n^* and are secure under new assumptions called q-Trapdoor Subgroup Diffie-Hellman (TSDH) and q-Trapdoor Subgroup Exponent Inversion (TSEI). We show that given several secret keys in case of IBE or several signatures in case of PKS, one can easily extract the trapdoor and break security of the proposed schemes.

ePrint: https://eprint.iacr.org/2016/512

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