KABLOSUZ ÇOKLU ORTAM ALGILAYICI AĞLARINDA DAMGALAMA İLE GÜVENLİ VERİ KÜMELEME

Kablosuz Çoklu ortam Algılayıcı Ağları (KÇAA) birden çok algılayıcı ünitesine sahip algılayıcı düğümlerinin oluşturduğu ısı, nem v.b. basit veriler dışında video ve fotoğraf gibi verilerin de toplanabildiği bilgi toplama ağlardır. KÇAAlar genellikle askeri yada sivil izleme/takip uygulamalarında kullanıldıkları için bu ağlarda güvenliğin sağlanması bir zorunluluktur. Geleneksel kablosuz algılayıcı ağlarında olduğu gibi, KÇAAları oluşturan algılayıcı düğümleri de enerji ve bantgenişliği açısından oldukça kısıtlıdır. Bu nedenle KÇAAlarda veri toplama işlemi hem güvenli hem de enerji etkin bir şekilde yapılmak zorundadır. Bu çalışmada KÇAAlarda veri toplama işlemini güvenli ve enerji etkin hale getirecek sayısal damgalama tabanlı veri kümeleme protokolü geliştirilmiştir. Geliştirilen protokolde algılayıcılar gizlemek istedikleri verileri fotoğraf verisi içine saldırılara karşı dayanıklı bir algoritma ile gömmekte ve bu damgalanmış veriler ise veri kümeleyiciler tarafından kümelenmektedir. Performans analizi ve benzetim çalışmaları, önerilen sistemin güvenli veri kümeleme sağlarken veri iletim miktarında da azalmaya neden olduğunu göstermektedir.

SECURE DATA AGGREGATION IN WIRELESS MULTIMEDIA SENSOR NETWORKS VIA WATERMARKING

Wireless Multimedia Sensor Networks (WMSNs) consist of a large number of sensor nodes that have multiple sensing units. Unlike traditional wireless sensor networks, WMSNs are used to collect multimedia data such as video or image. As WMSNs are employed by military or civil surveillance/tracking applications security of these Networks must be ensured. As in traditional wireless sensor networks, sensor nodes in WMSNs are resource limited. Hence, data collection in WMSNs must be performed in an energy efficient way. In this study, a watermarking based protocol that ensures secure and energy efficient data collection in WMSNs is proposed. In the proposed protocol, sensor nodes embed the secret data into image data using an attack resilient watermarking algorithm and data aggregators aggregate the image data. Performance analysis and simulations show that the proposed protocol ensures secure data aggregation and reduces the amount of data transmission.

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