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Browsing by Author "Doğanaksoy, Ali"

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    Article
    Modified Attribute-Based Authentication for Multi-Agent Systems
    (2023) Saran, Ayşe Nurdan; Doğanaksoy, Ali; Saran, Ayşe Nurdan; Bilgisayar Mühendisliği
    Attribute-Based Encryption (ABE) is a type of authentication mechanism that validates both the users and their attributes. It is practical for the systems that need authorization according to credentials. In a multi-agent system, specifying an access policy within the user groups is crucial to enable authentic and confidential communication. This paper proposes an attribute-based authentication framework based on elliptic curves to provide privacy in multi-agent systems. In this system, we aim to alleviate the required burden of verification by ensuring that each unit verifies only a small amount of messages. Inspired by Zhang et al. [1], we use ABE for the multi-agent system to authenticate more than one user at a time; our scheme uses elliptic curve groups, unlike Zhang et al. We have thoroughly evaluated the various security attributes and discussed computational overheads for our proposed scheme.
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    Publication
    New distinguishers based on random mappings against stream ciphers
    (Springer-Verlag Berlin, 2008) Turan, Meltem Sönmez; Çalık, Çağdaş; Saran, Nurdan Buz; Doğanaksoy, Ali; 20868
    Statistical randomness testing plays an important role in security analysis of cryptosystems. In this study, we aim to propose a new framework of randomness testing based on random mappings. Considering the probability distributions of coverage and P-lengths, we present three new distinguishers; (i) coverage test, (ii) p-test and (iii) DP-coverage test and applied them on Phase III Candidates of eSTREAM project. We experimentally observed some statistical weaknesses of Po-maranch using the coverage test.