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Attacks on an ISO/IEC 11770-2 key establishment protocol
No full textThis paper demonstrates that two types of serious attack (replay and type) are possible on an ISO/IEC server-based key establishment protocol. The flaw is associated with the method used to ensure the freshness of an established key. Two possible solutions are proposed to deal with the identified weakness. This is of great potential impact and as a result of this work, ISO published a technical corrigendum (ISO/IEC 11770-2:1996/Cor 1:2005) to remove the protocol from ISO/IEC 11770-2: 1996
Attacks on an ISO/IEC 11770-2 key establishment protocol
No full textAbstract Two possible types of attack (a replay attack and a type attack) on a key establishment protocol (mechanism 12) standardised in ISO/IEC 11770-2 are described and two solutions are proposed
Attacks On An ISO/IEC 11770-2 Key Establishment Protocol
Get PDFTwo possible types of attack (a replay attack and a type attack) on a key establishment protocol (mechanism 12) standardised in ISO/IEC 11770-2 are described and two solutions are proposed
Improving the ISO/IEC 11770 standard for key management techniques
No full textWe provide the first systematic analysis of the ISO/IEC 11770 standard for key management techniques [18, 19], which describes a set of key exchange, key authentication, and key transport protocols. We analyse the claimed security properties, as well as additional modern requirements on key management protocols, for 30 protocols and their variants. Our formal, tool-supported analysis of the protocols uncovers several incorrect claims in the standard. We provide concrete suggestions for improving the standard
Improving the ISO/IEC 11770 standard for key management techniques
Get PDFWe provide the first systematic analysis of the ISO/IEC 11770 standard for key management techniques (2009, 2009), which describes a set of key establishment, key agreement, and key transport protocols. We analyse the claimed security properties, as well as additional modern requirements on key management protocols, for over 30 protocols and their variants. Our formal, tool-supported analysis of the protocols uncovers several incorrect claims in the standard. We provide concrete suggestions for improving the standard
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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