@thesis{Loss2021, author = {Loß, Bastian}, title = {Cryptographic methods for aircraft-internal avionics communication based on symmetrical authenticated encryption using AES}, publisher = {Technische Hochschule Ingolstadt}, address = {Ingolstadt}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:573-8294}, pages = {xvi, 63}, year = {2021}, abstract = {Avionics communication can be subjected to cyberattacks intended to steal or manipulate internal data. A common solution to this problem is the employment of software-based cryptography to ensure the integrity and confidentiality of the messages sent. However, the concept of employing cryptography to secure internal aircraft communications was only superficially considered in the current research. Instead, the research mainly focused on securing external systems, such as ACARS and ADS-B. For this reason, this study aimed to propose a security solution using software-based cryptography for securing aircraft-internal avionics communication. At the beginning of the research, the scope of all algorithms was reduced to the usage of symmetric authenticated encryption for securing avionics communication. Performance measurements were conducted that showed the superior performance of AES 128 CTR-HMAC SHA 256 over other algorithms. Based on that, a high-level architecture was developed that describes the operational process of the security concept. Accordingly, the cryptographic system is constituted by the combination of the high-level architecture and the selected algorithms. However, the system was not implemented on avionics hardware. Instead, calculations were carried out based on the performance results of the individual algorithms to obtain the cryptographic system's performance. An assessment of these results provided evidence that the cryptographic system is suitable for the proposed avionics scenario.}, language = {en} }