Denial of service attack

This document discusses security issues and proposed solutions for wireless sensor networks. It begins by defining wireless sensor networks and describing common applications. It then outlines several security threats like denial of service attacks, wormhole attacks, sybil attacks, and traffic analysis attacks. It also discusses proposed cryptography and authentication schemes to provide data confidentiality, integrity, and freshness. Finally, it advocates for a holistic security approach that considers all network layers rather than focusing on single layers.

Lecture Outlines Why Security is Important for WSN WSNs have many applications e.g.: military, homeland security assessing disaster zones Others. This means that such sensor networks have mission-critical tasks. Security is crucial for such WSNs deployed in these hostile environments. Why Security is Important for WSN Moreover, wireless communication employed by WSN facilitates eavesdropping and packet injection by an adversary. These mentioned factors require security for WSN during the design stage to ensure operation safety, secrecy of sensitive data, and privacy for people in sensor environments. Algorithms to achieve security services Symmetric Encryption Asymmetric Encryption Hash Function/Algorithm Digital Signature Why Security is Complex in WSN Because of WSNs Characteristics: Anti-jamming and physical temper proofing are impossible greater design complexity and energy consumption Denial-of-service (DoS) attack is difficult Sensor node constraints Sensor nodes are susceptible to physical capture Deploying in hostile environment. eavesdropping and injecting malicious message are easy Using wireless communication Why Security is Complex in WSN Because of WSNs Characteristics: maximization of security level is challenging Resource consumption asymmetric cryptography is often too expensive Node constraints centralized security solutions are big issue no central control and constraints, e.g. small memory capacity. Cost Issues Overall cost of WSN should be as low as possible. Typical Attacks to WSN Physical Attacks Environmental Permanently destroy the node, e.g., crashing or stealing a node. Attacks at the Physical Layer Jamming: transmission of a radio signal to interfere with WSN radio frequencies. Constant jamming: No message are able to be sent or received. Intermittent jamming: Nodes are able to exchange messages periodically Jamming Attack Countermeasure Physical Attacks Node Capture Attacks routing functionalities Countermeasure tamper-proof features Expensive solution Self-Protection disable device when attack detected Attacks on Routing Sinkhole attack attacker tries to attract the traffic from a particular region through it Solution: Watchdog Nodes can start to trace the source of false routing information Attacks on Routing Sybil attack (Identity Spoofing) attacker claims to have multiple identities or locations provide wrong information for routing to launch false routing attacks Solutions: Misbehavior Detection. Identity Protection Privacy Attacks Attempts to obtain sensitive information collected and communicated in WSNs Eavesdropping made easy by broadcast nature of wireless networks Traffic analysis used to identify sensor nodes of interest (data of interest), WSN Privacy Issues Cont. WSN Privacy Issues Attack Trust and reputation in WSN WSN Traditional Security Techniques Cryptographic primitive

This document summarizes security schemes for wireless sensor networks, including TinySec, IEEE 802.15.4, and others. It discusses the challenges of WSNs like power constraints and limited resources. It also outlines common security threats to WSNs such as denial of service attacks, attacks on information in transit, Sybil attacks, black hole/sinkhole attacks, and hello flood attacks. The document evaluates the feasibility of applying basic security schemes like cryptography and steganography to WSNs given their unique constraints and requirements.

The document discusses random key material distribution for securing wireless sensor networks. It first provides background on wireless sensor networks and their design challenges. It then discusses security issues like authentication and key agreement. It describes threats like node duplication and wormhole attacks. The document proposes distributing a random subset of keys from a large pool to each sensor node so they can find common keys to securely communicate and form a connected network, without a central trusted authority. However, compromising enough nodes could allow reconstructing the full key pool.

This document discusses the risks and security standards of two wireless local area network technologies: Bluetooth and Wi-Fi. It provides an overview of how each technology works and its vulnerabilities. Both Bluetooth and Wi-Fi are susceptible to attacks like eavesdropping, man-in-the-middle attacks, and denial of service attacks. The document outlines security protocols and standards developed for each technology, including WEP, WPA, WPA2, and Bluetooth's pairing and encryption processes. It also describes different types of attacks targeting each technology like bluejacking, bluesnarfing, and WAPkitting. The goal of the document is to educate about the risks of these wireless technologies and how security standards aim to address vulnerabilities.

different security techniques and challenges of wireless sensor network including IEEE 802.15.4 and Zig-bee security.

While wireless sensor networks face security challenges, addressing issues like confidentiality, integrity, and availability is critical for successful deployment. The document discusses these security requirements and explains how attacks can target different network layers. It provides examples of physical layer attacks like jamming and tampering. At higher layers, attacks include collisions and resource exhaustion in the data link layer, and spoofing, selective forwarding, sinkholes, Sybil attacks and wormholes in the network layer. Transport layer attacks involve flooding and desynchronization. Confidentiality, integrity, and cryptography are also discussed as important security concepts for wireless sensor networks.

Wireless sensor networks consist of distributed autonomous devices that can monitor various environmental conditions. Securing these networks is challenging due to constraints on sensors' processing, memory, and battery power. Attacks on wireless sensor networks can target security mechanisms or routing mechanisms. Common attacks include denial of service through jamming, spoofing and altering information in transit, replication attacks, and physical node destruction. Effective security schemes must provide data confidentiality, integrity, and freshness given sensors' limitations. Developing efficient detection of compromised nodes reporting false data while ensuring holistic security in wireless sensor networks remains an important research challenge.

1) The document discusses security issues in wireless sensor networks, specifically focusing on attacks against routing protocols and potential countermeasures. It outlines common attacks like spoofing, selective forwarding, sinkhole attacks, Sybil attacks, wormholes, and HELLO flood attacks. 2) The document then provides an overview of potential countermeasures like link layer security, identity verification protocols, verification of link bidirectionality, and multipath routing. 3) Finally, the document emphasizes the importance of secure routing protocol design and highlights the need for protocols to incorporate security features to defend against insider and outsider attacks.