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Several block cipher modes of operation have been proposed in the literature to protect sensitive information. However, different security analysis models have been presented for attacking them. The analysis indicated that most of the current modes of operation are vulnerable to several attacks such as known plaintext and chosen plaintext/cipher-text attacks. Therefore, this paper proposes a secure block cipher mode of operation to thwart such attacks. In general, the proposed mode combines one-time chain keys with each plaintext before its encryption. The challenge of the proposed mode is the generation of the chain keys. The proposed mode employs the logistic map together with a nonce to dynamically generate a unique set of chain keys for every plaintext. Utilizing the logistic map assures the dynamic behavior while employing the nonce guarantees the uniqueness of the chain keys even if the same message is encrypted again. In this way, the proposed mode called SPCBC can resist the most powerful attacks including the known plaintext and chosen plaintext/cipher-text attacks. In addition, the SPCBC mode improves encryption time performance through supporting parallelized implementation. Finally, the security analysis and experimental results demonstrate that the proposed mode is robust compared to the current modes of operation. [ABSTRACT FROM AUTHOR]

The recent advancements in electronics and communications technology have enabled the extensive deployment of wireless sensor networks (WSNs) into a variety of areas including homeland security, military systems, industrial, and health care. WSNs are typically deployed in unattended, hostile and harsh environment which makes them subject to several attacks such as sinkhole, spoofing or Sybil, wormhole, and selective forwarding. Therefore, developing secure, load-balanced and scalable routing protocols for WSNs has become imperative. In the recent literature, most of the routing protocols take the routing decision based on information collected from neighboring nodes. However, this allows a malicious sensor node to deceive its neighbors and forward their packets through it. This makes the network's nodes vulnerable to various attacks. Therefore, in this paper we propose a Dual Sink Secure Routing Protocol (DSSRP) for WSNs. The DSSRP is a scalable protocol for secure routing in which, the routing decision of a node is based on its own information. Thus it cannot be deceived by any other sensor node. Extensive simulation results indicate clearly that, the DSSRP protocol achieves very high confidentiality, integrity, authentication, and non-repetition with a very low overhead. In addition, the proposed protocol exhibits a grateful performance under attack-free conditions by evenly distributing the network load among the deployed nodes thus extending the network lifetime. [ABSTRACT FROM AUTHOR]