Szoftverrádión alapuló adaptív entrópiaforrás genetikus algoritmus segítségével

Röviden bemutatjuk a véletlen számok főbb felhasználási területeit, és előállítási lehetőségeiket. Nagyon röviden a szoftverrádiók működését ismertetjük. Bemutatjuk azt, hogyan lehet genetikus algoritmus (GA) segítségével megtalálni az optimális beállítási paramétereket. A bemutatott módszerek jól használhatóak olyan adaptív rendszerek kialakítására, melyek időben változó tulajdonságú entrópia forrást alkalmaznak

Performance Analysis of Encryption Capabilities of ARM-based Single Board Microcomputers

In the few years since the Raspberry Pi was released in 2012, countless microcomputers based on the ARM architecture have been introduced.Their small size, high performance relative to their power consumption, and the ability to run the popular Linux operating system make them ideal for a wide range of tasks. Information security is an area of particular importance. Different encryption and encoding algorithms play an important role in almost all areas of information security. However, these algorithms are very computationally intensive, so it is important to investigate which microcomputers can be used for these tasks, and under which trade-offs. The performance of ten different microcomputers is investigated and presented for the application of common symmetric and public-key encryption and decryption, digest creation and message authentication protocols, such as RSA, AES, HMAC, MD5, SHA. Reliable encryption requires the generation of reliable (pseudo)random numbers (Cryptographically Secure Random Numbers, CSRN), and microcomputers based on ARM SoCs usually have hardware implemented (pseudo)random number generators. The applicability of the random number generat er generators. The applicability of the random number generators of different microcomputers are investigated and presented; test methoods are described , and recommendations are made

Improving the performance and security of the TOTD DNS64 implementation

DNS64 and NAT64 IPv6 transition mechanisms are expected to play an important role in the near future to solve the problem that some of the new clients will not be able to get public IPv4 addresses and thus having only IPv6 addresses they still should be able to reach servers that have only IPv4 addresses. In our earlier experiments, the TOTD DNS64 implementation showed significantly better average performance than BIND, however TOTD was not stable, therefore now it was carefully tested to find the reason for its experienced strange behavior. Besides the detailed description of the testing method, the bug and the correction, a security vulnerability is disclosed and a patch is provided. The performance and the stability of the modified versions of TOTD are analyzed and compared to that of the original TOTD and BIND.Facultad de Informátic

Benchmarking Further Single Board Computers for Building a Mini Supercomputer for Simulation of Telecommunication Systems

Parallel Discrete Event Simulation (PDES) with the conservative synchronization method can be efficiently used for the performance analysis of telecommunication systems because of their good lookahead properties. For PDES, a cost effective execution platform may be built by using single board computers (SBCs), which offer relatively high computation capacity compared to their price or power consumption and especially to the space they take up. A benchmarking method is proposed and its operation is demonstrated by benchmarking ten different SBCs, namely Banana Pi, Beaglebone Black, Cubieboard2, Odroid-C1+, Odroid-U3+, Odroid-XU3 Lite, Orange Pi Plus, Radxa Rock Lite, Raspberry Pi Model B+, and Raspberry Pi 2 Model B+. Their benchmarking results are compared to find out which one should be used for building a mini supercomputer for parallel discrete-event simulation of telecommunication systems. The SBCs are also used to build a heterogeneous cluster and the performance of the cluster is tested, too