Secure and Dynamic Publish/Subscribe: LCMsec: LCMSec: The Proposed Protocol

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Introducing LCMSec, a secure, brokerless Publish/Subscribe protocol for IoT and automotive applications, enhancing LCM with low-latency.

Authors: Moritz Jasper, Barkhausen Institut gGmbH, Wurzburger Straße 46, Dresden, Germany ; Stefan Kopsell, Barkhausen Institut gGmbH, Wurzburger Straße 46, Dresden, Germany . Table of Links Abstract and Introduction Related Work Description of

sec protocol in detail. Domain A receiver can use kg to decrypt the channelname, then look up the associated kch to decrypt the message. This carries with it a concession in terms of confidentiality: If an attacker has access to kg , he can learn the channelname of messages on other channels. However, the alternative – encrypting the channelname and payload with a single key which is unique to the

header, multiple parties might be communicating on one channel with the same key. Since they increment their sequence number separately, we also need to uniquely identify senders to form a unique IV. To this end, we use a 16-bit sender ID. According to the NIST recommendations, we construct a deterministic 96-bit IV as shown in Figure 4. The salt, which has not yet been discussed, will be generated as part of the keying material described in Section VI-B.

is thus 18 bytes: two for the sender id and 16 for the authentication tag produced by GCM. Fragmented messages: As explained in Section III, messages that do not fit into a single UDP packet are supported by sec. More importantly, the msgid functions to prevent replay attacks. To keep track of already received messages, a sliding window of the greatest sequence number received for each peer can be used, in addition to a window of previously received messages. To efficiently keep track of this window, the algorithm in appendix C of RFC2401 or RFC6479 can be used. B. Group Discovery and Key Agreement This section describe how the shared symmetric keying material is generated.

Domain L. This IDU , which is understood to be the identity for that user on L is encoded into the URN of the Subject Alternative Name Extension of the certificate in accordance with RFC 5280 . A Certificate Authority can issue this certificate and generate the unique identifier for each domain by incrementing it.

, we aim to achieve these prerequisites without a central instance to coordinate. We will call the protocol we use to achieve this the

 

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