Visible to the public Cryptoanalyzing and Improving for Directed Signature Scheme and the Proxy Signature Scheme

TitleCryptoanalyzing and Improving for Directed Signature Scheme and the Proxy Signature Scheme
Publication TypeConference Paper
Year of Publication2018
AuthorsHu, Xiaoming, Jiang, Wenrong, Ma, Chuang, Yu, Chengcheng
Conference Name2018 11th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)
KeywordsComputational efficiency, Computer security and privacy, cryptoanalysis, data privacy, digital signature, digital signatures, directed signature scheme, ECC, Elliptic curve cryptography, forward secure proxy signature, FoSPS, handwriting recognition, private key cryptography, private key exposure, proxy signature scheme, pubcrawl, public key cryptography, public signature verification problem, Resiliency, Scalability, security analysis
AbstractForward secure proxy signature (FoSPS) solves the security drawback of private key exposure problem of generating the private key of each time interval. Directed signature scheme solves the public signature verification problem in traditional digital signature by designating the constant one as the signature verifier. Due to excellent properties, the two signature schemes have attracted the research of many experts. Recently, based on the Elliptic curve cryptography (ECC), a new FoSPS scheme and directed signature scheme were proposed. In this paper, we analyze the two schemes and present which the either of both schemes is insecure and do not satisfy the unforgeability. In other words, anyone is able to forge a valid signature but the one does not know the signer's secret key. In the same time, we give the main reasons why the enemy is able to forge the signature by analyzing the two schemes respectively. And we also present a simple improvement idea to overcome existing problems without adding extra computational cost which can make them applied in some environments such as e-medical information system.
DOI10.1109/CISP-BMEI.2018.8633255
Citation Keyhu_cryptoanalyzing_2018