Digital modeling of the real world with 3D modeling technologies has recently prepared the groundwork for Metaverse. Metaverse is an ecosystem that will allow social and cultural events in the real world to be carried out in the digital world as well. Inspired by this framework, this study presents an approach called MetaRepo, where users can securely store digital assets (cryptocurrency, avatars, clothes, tickets, etc.) and use them in various activities within the metaverse universe. The motivation for the realization of this study is the security problems in the exchange, buying and selling transactions that take place in the virtual universes that have become popular in recent days. Another source of motivation is the anxiety of the object owners having their possessions stolen, lost, and transferred to another universe in the Metaverse. Blockchain technology, which can store assets in MetaRepo, has been used to address these concerns. In the developed blockchain structure, New User Engine, Transaction Centre, Authenticator Engine (Weng) and Repos models have been developed for user interaction, transaction processing and security mechanism. An exemplary metaverse universe including social activities has been designed for the testing and evaluation processes of the proposed MetaRepo approach. MetaRepo is communicated from the browser via APIs. Detailed performance analysis has been carried out for the proposed model. As a result, with MetaRepo, a mechanism is aimed at which users can communicate with different metaverse universes and platforms without the need for extra verification and security measures within the metaverse universe.
The works produced within the music industry arepresented to their listeners on a digital platform,taking advantage of technology. The problems of thepast, such as pirated cassettes and CDs, have left theirplace to the problem of copyright protection on digitalplatforms today. Block chain is one of the mostreliable and preferred technologies in recent timesregarding data integrity and data security. In thisstudy, a blockzincir-based music wallet model isproposed for safe and legal listening of audio files.The user's selected audio files are converted intoblock chain structure using different techniques andalgorithms and are kept securely in the user's musicwallet. In the study, performance comparisons aremade with the proposed model application in terms ofthe length of time an ordinary audio player can addnew audio files to the list and the response times ofthe user. The findings suggest that the proposedmodel implementation has acceptable differences inperformance with an ordinary audio player.
In this study, the vulnerability tests were carried out through the techniques of penetration, crack and impersonation the wireless network connections in which the thing in the industry 4.0 was communicating. The MAC addresses of all the devices by the penetration technique has been seen in the network identified. The device is dropped from the network using de-auth attacks with MAC address. As a result of this, the operation of Industrial 4.0 systems is interrupted or stopped. It is possible to predict the standard passwords of the distributors with WPS feature turned on by means of cracking techniques and to penetration the wireless network or to disable the network. In the end, it can be seen that the existing data can be deleted or collected by adding a new device to the system with the fake technique of the wireless network. The results showed that WEP, WPA, and WPA2 security were not sufficiently used in the wireless network. As a result of the penetration methodology, it was determined that the use of wireless networks would not be a solution in the connections where data security was high in Industry 4.0.
Günümüzde bir konunun araştırılması, toplumun görüşünün alınması ya da tutumunun tespit edilebilmesi için araştırma anketleri, yüz yüze danışma, telefon görüşmeleri, web anketleri gibi çeşitli yöntemler kullanılmaktadır. Bu yöntemlerden en hızlı ve düşük maliyetli olan yöntem web anketleridir. Günümüzde küresel bazda yaşanan Covid-19 bulaş hastalığının kalabalık alanlarda yarattığı riskler göz önünde bulundurulduğunda web üzerinde çalışan sistemler hayati öneme sahiptir. Web anketi tercih edildiğinde sunucu tabanlı çalışan web uygulamaları kullanılmaktadır. Fakat sunucu tabanlı uygulamalar veri güvenliği ile ilgili bazı endişeler oluşmasına sebep olabilmektedirler. İstemci düğümlerinden sunucuya gönderilen oylama bilgileri, merkezi bir sunucu üzerindeki veri tabanına kaydedilmektedir. Verinin merkezi bir sunucu üzerinde depolanması yönteminin en büyük dezavantajı, oylama sonuçlarının siber saldırılar ya da kurcalanma risklerine savunmasız olmasıdır. Bu durum yapılan oylama sonuçlarının güvenliğini ciddi oranda olumsuz etkilemektedir. Blok zincir teknolojisi son yıllarda veri güvenliği alanında sıkça kullanılmaktadır. Blok zincir teknolojisinde sistemi merkezi bir sunucu yönetmemektedir. Eşler arası ağ oluşturulup hesap defterinin tamamının bütün düğümlerde yer alması prensibi esastır. Bu yapısı ile veri güvenliği açısından avantajlı bir teknolojidir. Ayrıca blok zincir teknolojisi, verilerin tek bir blok olarak şifrelenmesinden dolayı siber saldırılara ve dış müdahalelere karşı da güvenli durumdadır. Bu çalışmada farklı fikir ya da görüşlerin oylanması, oylama sonuçların gösterilmesi için blok zincir temelli güvenli bir elektronik oylama modeli önerilmiştir. Çalışmada C# dilinde blok zincir yapısı oluşturularak düğümlerden kullanılan oy verilerinin bir blok olarak şifrelenmesi ve bloğun zincire eklenmesi sağlanmıştır. Blok zincir tabanlı geliştirilen sistemin güvenli ve güvenilir olmasını, seçimde bulunan insanların güvenini artırmaya yardımcı olmasını bekliyoruz.
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