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The main objectives of the project are:
The key issues associated with the implementation of transmission security are as follows:
The main benefit from the project is the proposition of a solution for supporting transmission security in the DVB-RCS networks, which would increase the appeal of such networks to a broader market (e.g. including Military and Government applications).
While the solution may include implementation-specific elements, the project has endeavoured to define, as a minimum, an overall security architecture (figure below) identifying the interfaces (“hooks”) between the existing DVB-RCS elements (seen as COTS) and the new TRANSEC-specific functional blocks, primarily the TRANSEC Cryptographic Unit, responsible for link layer encryption / decryption – the main transmission security countermeasure. Other countermeasures can be implemented by enhancing the functionality of existing DVB-RCS elements. The defined security architecture / interfaces can be used as a basis for the evolution of the DVB-RCS NG standard to include the TRANSEC feature.
Figure 1. TRANSEC system architecture
The most common security threats encountered in the DVB-RCS networks, the associated risks and the envisaged countermeasures are summarised in the Table 1 below.
The main countermeasure technique consists in link layer encryption of control and management messages and also of user traffic, provided by a new functional block – the TRANSEC Cryptographic Unit (TCU), which also has key management responsibilities. TCU is implemented in both hub and satellite terminal, where it interacts with other DVB-RCS network elements for message flows (plain text, encrypted) and also for local control. TCU “hook-up” points are identified in the relevant security architectures and generic interfaces are defined, capable of accommodating various encryption algorithms / operation modes.
The majority of other countermeasure techniques are specified (at high level) as enhancements to the existing DVB-RCS network elements / functional blocks.
The project work extends over a 6-month period and is divided in four separate tasks:
The project has successfully finished all tasks. All technical notes, the final report and the executive summary have been submitted and accepted by the customer, and the final review / presentation took place successfully. Moreover, a TRANSEC proposal for DVB-RCS NG standard evolution has been submitted to DVB-RCS NG group, and a presentation has been made at RCS#61 meeting.
By finishing all tasks the project team has satisfied all project objectives.