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Msc. Telecommmunication Eng. 1
TOPIC: SATELLITE LINK PROTECTION
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Presentation Layout
Introduction
Conventional Protection
Advanced link protection Encryption
Intrusion Detection Systems
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Introduction
Link Protection is a blanket term that refers tothe methods employed to thwart attempts tosteal data from a data transfer link .
For an Unprotected Link, traffic is sent andreceived in cleartext, which means thatanybody who can see the network traffic is freeto copy and use the data on the link as they see
fit .
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Conventional Link Protection
Conventional methods for protecting ground
controlled satellites from unauthorized
acquisition include the use of a coded
command.
For such system the required electronic
phase synchronization equipment is not only
costly but also adds weight to the systemresulting in payload reduction by as much as
28pounds.
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Advanced link protection
In modern ways satelite link protection is
done by either
Encryption
Intrusion Detection Systems
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Encryption
Encryption is typically used to take this ability
away from those watching network traffic.
This makes it possible to transfer media fromthe content source to a rendering device in a
secure manner.
Normally Advanced Encryption Standard
(AES-128) is used to encrypt data beforetransport.
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This encryption establishes the secure
channel necessary for Link Protection.
Hence Earth Stations can authenticate other Earth
Stations, as well as communicate without fear of
content misuse or theft.
And normally this is implemented relatively
transparently.
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Intrusion Detection Systems
The advanced method is the use of Intrusion
Detection System (IDS)
IDS will be properly tailored to detect
anomalous events along interconnected
networks and provide countermeasures to
avoid system failure
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Satellite IDS exploits two types methods
Traffic analyzer, and
The SYN detector
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Traffic analyzer
Traffic analyzer probes run on the access router of allthe networks interfaced to the satellite network. Suchprobes aim to collect statistics about traffic coming fromand going to the satellite network.
Specifically, a traffic analyzer grabs the number oftransferred bytes over any active connection.
A time interval must be defined for such measurements.
A large value allows a better measurement accuracy,
but it slows down statistic updates for the attackdetection matters.
On the contrary, a low value could be affected bytransitory traffic dynamics, as for instance unexpectedtraffic spikes or idle times.
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The SYN detector
The SYN detector is installed on Satellite
gateway and is in charge to monitor all the
traffic in order to create an IPFIX record for
every SYN/FIN exchange through satellite
link.
Each record includes the parameters
identifying the specific connection and it isenhanced with the time information.
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Telespazio (TSP) a satellite geostationary link,
remote terrestrial LAN of Polska Telefonia Cyfrowa (PTC),
ISP represented by Telefonica (TID).
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Thanks for your attentions.