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The main purpose of block ciphers is to ensure data confidentiality, integrity and robustness against security attacks. Nevertheless, several ciphers also try to be efficient in encryption and decryption phases, have a small energy consumption and/or small memory footprint. These ciphers are usually optimized for certain software or hardware platforms. In this work, we analyze lightweight and classic block ciphers. Further, we implement an application which employs 20 current software-oriented block ciphers and benchmark them on a smartphone. The experimental results and the performance evaluation of ciphers are presented. Moreover, we compare the performance of two forms of implementation by native JAVA cryptography APIs and by an external cryptography provider. In addition, we measure the current consumption of the selected block ciphers on a smartphone. [ABSTRACT FROM AUTHOR]

The security of videoconferencing or telephony data transmissions is a very important problem. There are several approaches how to protect communication in general. Videoconferencing or telephony over IP networks is a specific case of security assurance. There are many H.323 clients in the world, no matter whether software or hardware black box. Many of them are closed systems, which are used a lot but with no security. It could be expensive and in some cases complicated to update these clients to provide security functions. This article deals with a relatively cheap, secure and general enough solution of security provision in H.323 networks without need to modify the current H.323 software. [ABSTRACT FROM AUTHOR]