Most of the data transmission networks used today are based on the technology of the Synchronous Digital Hierarchy (SDH) or Synchronous Optical Networks (SONET) respectively. However rarely, they support any security services for confidentiality, data integrity, authentication or any protection against unauthorized access to the transmitted information. It is the subscriber's responsibility to apply security measures to the data before the information is passed on to the network. The use of encryption provides data confidentiality. This, however, requires consideration of the underlying network technology. The method described in this paper allows the use of encryption in broadband networks. The advantages of this method are the transparency of the encryption applied to the signal structure and signal format, and the automatic resynchronization after transmission errors. The used mode of operation, is called "statistical self-synchronization", because the synchronization between encryption and decryption is initiated by the presence of a certain bit pattern in the ciphertext, which occurs statistically. An encryption device, designed for SDH/SONET-networks with transmission rates of 622 Mbit/s, is to be presented.
Because of the increasing number of electronic components, the automotive manufacturers introduced data bus systems to decrease the number of discrete lines. Inside modern vehicles there are several bus systems that are used for communication to provide many safety-relevant functions with direct impact to the vehicle's behaviour. Due to missing security services, these in-car networks are unprotected against malicious attacks. Exemplarily focussing CAN, this article explains that the missing of authenticity and confidentiality are the most important issues concerning security risks for in-car communication. A flexible and adaptive solution using trusted communication groups is presented that enables confidential communication between components of a vehicle and guarantees that only authentic controllers -holding a certificate signed by the manufacturer -are able to be part of these closed communication groups.
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