منابع مشابه
Security Flaws in Several Group Signatures Proposed by Popescu
In resent years, Popescu proposed several group signature schemes based on the Okamoto-Shiraishi assumption in [8–11], and claimed his schemes are secure. However, this paper demonstrates that these schemes are all insecure by identifying some security flaws. Exploiting these flaws, an attacker without any secret can mount universally forging attacks. That is, anybody (not necessarily a group m...
متن کامل3 Serious Flaws in
Understanding the effect of a heuristic on the time complexity of the well-known A∗ search algorithm has been a subject of a large research body in AI. Among those researches is Korf et al.’s analysis (Korf & Reid, 1998; Korf et al., 2001; Korf, 2000a; Korf, 2000b), which concluded that the effect of a heuristic is to reduce the effective depth rather than effective branching factor. Since this...
متن کاملDesign flaws in EuroSCORE II.
We recently read with great interest and anticipation the development of the EuroSCORE II. However, we have methodological concerns relating to how EuroSCORE II was developed and evaluated [1] and subsequent comments made in an editorial by the authors responding to recent criticisms [2]. We focus on the strategy and study design used to derive and evaluate the model. The authors randomly split...
متن کاملFlaws in the Efficiency Gap
Gerrymandering is returning to the Supreme Court. For the first time in three decades, a federal court invalidated redistricting legislation on the grounds that it constituted a partisan gerrymander in violation of the Fourteenth Amendment. That court relied, in part, on a new tool—the efficiency gap—which some have touted as the means to “end gerrymandering once and for all.” We evaluate this ...
متن کاملAn analysis with serious flaws.
TO THE EDITOR—Pasipanodya and Gumbo address an important question in their article: Is directly observed therapy (DOT) superior to self-administered treatment (SAT) for tuberculosis? [1] Unfortunately, however, their analysis contains some serious flaws. Two of the distinct studies that the authors include from Cape Town are actually from the same trial [2, 3]. Therefore, there is double counti...
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ژورنال
عنوان ژورنال: Deutsches Aerzteblatt Online
سال: 2015
ISSN: 1866-0452
DOI: 10.3238/arztebl.2015.0009b