A proxy signature scheme enables a proxy signer to sign messages on behalf of the original signer. In this paper, we demonstrate that a number of discrete logarithm based proxy signature schemes are vulnerable to an original signer’s forgery attack. In this attack, a malicious original signer can impersonate a proxy signer and produce a forged proxy signature on a message. A third party will in...

1. Calonje E, Fletcher CD, Wilson-Jones E, et al. Retiform hemangioendothelioma: a distinctive form of low-grade angiosarcoma delineated in a series of 15 cases. Am J Surg Pathol 1994;18:115-25. 2. Hirsh AZ, Yan W, Wei L, et al. Unresectable retiform hemangioendothelioma treated with external beam radiation therapy and chemotherapy: a case report and review of the literature. Sarcoma 2010;2010:...

online | memorias.ioc.fiocruz.br The urban presence of Lutzomyia longipalpis (Lutz & Neiva, 1912) (Salomón & Orellano 2005) was first recorded in Argentina in Formosa province in 2004; it was associated with an outbreak of visceral leishmaniasis (VL) in the neighbouring city of Asunción, Paraguay Republic. In 2006, in Posadas, which is located in Misiones province (also on the Paraguay border),...

The study of the statistical distribution of short quiescent times (≤ 30 minutes) between solar flares has been investigated on a 1D MHD model. A power law behaviour is found which indicates the existence of sympathetic flaring. This prediction is supported by recent observations. Solar flares are the most violent phenomena observed in the solar system. It is believed that they play a fundament...

plexity. This conclusion is conceptually similar to our own, and it little alters the broader impacts of our published findings; still, the general relevance of the issues warrants a response. In their reanalysis, Gutierrez-Ibanez et al. [2016] perform a ‘residual analysis’, which regresses body weight on brain weight with phylogenetic generalized least squares (PGLS) to obtain size-corrected r...

AMA Wang Y, Zhang W, Bao L, Lu Hong J. Transarterial chemoembolization with insertion of radioactive seeds for hepatocellular carcinoma. Videosurgery and Other Miniinvasive Techniques/Wideochirurgia i inne techniki małoinwazyjne. 2023. doi:10.5114/wiitm.2023.131539. APA Wang, Y., Zhang, W., Bao, L., Lu, & Hong, (2023). https://doi.org/10.5114/wiitm.2023.131539 Chicago You-Bin, Wei Le Yun Jiao H...

Over the past few years, Session Initiation Protocol (SIP) is found as a substantial application-layer protocol for the multimedia services. It is extensively used for managing, altering, terminating and distributing the multimedia sessions. Authentication plays a pivotal role in SIP environment. Currently, Lu et al. presented an authentication protocol for SIP and profess that newly proposed p...