Abstract. In this paper, we analyze the security vulnerabilities of two ultra-lightweight RFID mutual authentication protocols: LMAP and M 2 AP, which are recently proposed by Peris-Lopez et al. We identify two effective attacks, namely De-synchronization attack and Full-disclosure attack, against

Abstract — In this paper, we analyze the security vulnerabilities of a family of ultra-lightweight RFID mutual authentication protocols: LMAP [13], M 2 AP [14] and EMAP [15], which are recently proposed by Peris-Lopez et al. We identify two effective attacks, namely de-synchronization attack

Abstract—Privacy is faced to serious challenges in the ubiquitous computing world. In order to handle this problem, some researches in recent years have focused on design and analysis of privacy friendly ultralightweight authentication protocols. In less than a decade, many ultralightweight

Abstract. Recently, Chien proposed an ultralightweight RFID authentication protocol to prevent all possible attacks. However, we find two de-synchronization attacks to break the protocol. Key words: RFID, cryptanalysis, identification protocols 1

considering the security and privacy, and most of the protocols are heavyweight. In order to overcome these problems, this paper proposes an ultralightweight mutual authentication protocol, named ULMAP. ULMAP only uses Bit and XOR operations to complete the mutual authentication and prevent the denial

NVEs. The unstructured P2P system BubbleStorm offers flexible and scalable means and is therefore used as a fundamental base for the developed Pub/Sub system. As the evaluation of the subscription is performed

the desperation of users. To establish a secure basis for Internet communication, we propose SafeSlinger, a system leveraging the proliferation of smartphones to enable people to securely and privately exchange their public keys. Through the exchanged authentic public key, SafeSlinger establishes a secure channel

ii Internet broadcasting techniques are wide spread and have been the focus off many research projects. Due to high transmission delays these systems often lack interactivity. This thesis introduces a new streaming system to deliver real-time video and audio data with low-delays across the Internet. Packet loss, jitter and changing bandwidth availability describe the challenges that have to be handled by the system, since the Internet is a best effort network and does not guarantee quality of service. To lower bit-rates audio and video data are usually compressed in formats like MPEG-4. The high compression nearly eliminates redundancy in the audio and video data. A resultant loss of transmitted data and transmission errors can have big impact on the quality of the received stream. MPEG-4 video uses inter frame prediction, so errors propagate between frames. We will argue that retransmission of lost or invalid data is not feasible for low-delay communication due to high control loop delays.

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