CODEWITHSUNDEEP
data-distribution-service
Stoogy
Stoogy

Reputation: 1351

DDS Security: How are key generated for different publisher

After reading the OMG specification about secure DDS: https://www.omg.org/spec/DDS-SECURITY/1.1/

I understood that DDS participants will authenticate each others though a handshake and deduce a secret using DH. This shared secret is used for the publisher (writer) to share the key used to encrypt the messages published in order for a subscriber (reader) to decrypt the message.

However, what happens if there are multiple publishers for the same topic?

I am expecting the first option, but could not find confirmation within the OMG specification.

Upvotes: 3

Views: 174

Answers (1)

Reinier Torenbeek
Reinier Torenbeek

Reputation: 17373

However, what happens if there are multiple publishers for the same topic?

Each DataWriter (not Publisher) generates its own symmetric key which gets shared with all its matched DataReaders. The fact that multiple DataWriters may be writing to the same Topic does not change this -- each of them generates their own key and uses it to protects its own updates.

Note that this is the behavior as prescribed by the so-called built-in plugins as defined in Chapter 9 of the specification that you mentioned. These are defined to provide out-of-the-box functionality with interoperability between vendors. Customized plugins may behave differently.

Upvotes: 2

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