Institute of Fundamental Technological Research

Symmetric block ciphers are usually used in WSN for security services. This paper puts forward the idea of using advanced modes of operation of symmetric block ciphers to achieve confidentiality and authentication in one cryptographic operation. The modes of operation approved by NIST that is CMAC, CCM, GCM/GMAC are applied here. The benchmarks of these approaches in the terms of efficiency of nodes in WSN are presented.

Wireless sensor network, Cryptographic protocols, Block cipher modes, Sensor's security, Utilization efficiency

Electronic services in dynamic environment (e.g. e-government, e-banking, e-commerce, etc.), meet many different barriers reducing their efficient applicability. One of them is the requirement of information security when it is transmitted, transformed, and stored in an electronic service. It is possible to provide the appropriate level of security by applying the present-day information technology. However, the level of protection of information is often much higher than it is necessary to meet potential threats. Since the level of security strongly affects the performance of the whole system, the excessive protection decreases its reliability and availability and, as a result, its global security. In this paper we present a mechanism of adaptable security for, digital information transmission systems (being usually the crucial part of e-service). It makes it possible to guarantee the adequate level of protection for actual level of threats dynamically changing in the environment. In our model the basic element of the security is the Public Key Infrastructure (PKI) is enriched with specific cryptographic modules.

Network security, Information security, Cryptographic protocol, Cryptography, Risk management, Scalable security

Cryptographic protocols are secure due to application of security services. The security services applied for their protection can be classified into the three groups: hard, soft and extended. Among the extended ones, we can point out to the availability of the goal of the security protocol, which guarantees that protocols aims are achieved. In the real-time protocols as the video conference, the goal is both secure data transmission and good signal quality. When one of the goals is not ensured, the availability of the goal of the protocol is not guaranteed and the cryptographic protocol can not be realized. In this article we present the methodology of obtaining the balance between the quality of the signal in real-time systems and accomplishment of the required security services. Finally, the case study of video conference secured by VPN connections, is presented.