Background: Blockchain is a digitally managed, distributed, and decentralized ledger used to record transactions in an immutable format. Its characteristics in providing trust, transparency, and traceability make it attractive for applications where transactions are involved. Originally intended...

Diese Arbeit betrachtet zwei anspruchsvolle Probleme aus dem Bereich Computer- und Kommunikationssicherheit und Vertrauen. Beim Datenbank-Serviceprovider-Problem moechte ein Anwender seine Datenbank an einen Datenbank-Serviceprovider (DSP) uebergeben, damit dieser sie betreiben und ihm zur...

In this paper, we propose a unified framework for trust management that can cover a broad variety of trust mechanisms including reputations, credentials, local data and environment parameters. The proposed trust management framework leverages established standards and it covers a broad variety...

Ebben a cikkben az RFID (Rádiófrekvenciás azonosítás) technológia használata által felvetett adatbiztonsági kérdések kerülnek megtárgyalásra. Milyen támadási lehetőségek vannak, és milyen védekezési lépéseket tehetünk ezek kivédésére. Egy termék számtalan veszélynek...

We explore the consequences of the assumptions used in modern cryptographywhen applied to repeated games with public communication. Technically speaking, we model agents by polynomial Turing machinesand assume the existence of a trapdoor function. Under these conditions, we prove a Folk Theorem...

The problem of sharing manufacturing, inventory, or capacity to improve performance is applicable in many decentralized operational contexts. However, the solution of such problems commonly requires an intermediary or a broker to manage information security concerns of individual participants....

The computational encryption is used intensively by different databases management systems for ensuring privacy and integrity of information that are physically stored in files. Also, the information is sent over network and is replicated on different distributed systems. It is proved that a...

Chaotic maps have attracted great interest for its special use in secure communication systems. It is proved that for some chaotic maps defined by we can find an analytical solution, so systems can leads to predictability. In this letter, we propose a new kind of chaotic map based on...