Simulcrypt (SimulCrypt)

A DVB protocol published by ETSI used in IPTV / broadcast TV head-ends to enable use of multiple key management systems.

The standardised SCS (Simulcrypt Synchroniser) to ECMG (Entitlement Control Message Generator) interface is used to allow multiple key management systems to operate in parallel, each generating its own (typically proprietary) ECMs (Entitlement Control Messages).

The EMMG (Entitlement Management Message Generator) to MUX interface allows the CAS (Conditional Access System), which provides the ECMs, to provide an EMM (Entitlement Management Message) to be associated to the streamed service.

The interface between EIS (Event Information Scheduler) and SCS is used by the EIS to provide Scrambling Control Group (SCG) definitions and Access Criteria (AC) transitions, to allow the management of different services sharing the same key.

The PSIG (Program Specific Information Generator) to MUX interface is used by the PSIG to provide MUXes of the head-end with the appropriate PSI/SI (Program Specific Information/Service Information) tables for their respective transport stream.

History

XXX - add a brief description of PROTO history

Protocol dependencies

• SCS - ECMG: this interface uses TCP as its transport protocol. There is no well known TCP port for SIMULCRYPT traffic as multiple TCP connections are possible (typically each TCP connection is associated to a given key management system for a particular TV channel).

• EMMG - MUX: the head-end operator can choose between:

  - TCP based implementation for data provision and control;

  - UDP based implementation for data provision and TCP based implementation for control;

  - UDP based implementation for data provision and SIMF based implementation for control.

• EIS - SCS: this interface uses TCP as its transport protocol.

• PSIG - MUX: this interface may include the PSI/SI table carouselling performed by the PSIG and the PSI/SI table carouselling performed by the MUX. In the first case, the real implementation can be chosen between:

  - TCP based implementation for data and control;

  - ASI based implementation for data and TCP based implementation for control.

Example traffic

XXX - Add example decoded traffic for this protocol here (as plain text or Wireshark screenshot).

Wireshark

The SIMULCRYPT dissector is fully functional for the following interfaces: ECMG - SCS, EMMG - MUX, EIS - SCS, PSIG - MUX (supported also MUX - CiM and (P) - CiP interfaces). It decodes the Simulcrypt syntax to analyse different Simulcrypt messages and associated TLV parameters.

Preference Settings

There are some SIMULCRYPT_Preferences.

Example capture file

• SampleCaptures/SIMULCRYPT.pcap - Simulcrypt traffic over TCP on ports 8600, 8601 and 8602.

• SampleCaptures/ECMG-SCS.pcap - Simulcrypt traffic on the ECMG - SCS interface over TCP.

• SampleCaptures/EMMG-MUX.pcap - Simulcrypt traffic on the EMMG - MUX interface over TCP.

• SampleCaptures/EIS-SCS.pcap - Simulcrypt traffic on the EIS - SCS interface over TCP.

• SampleCaptures/PSIG-MUX.pcap - Simulcrypt traffic on the PSIG - MUX interface (and the MUX - CiM interface) over TCP.

Display Filter

A complete list of PROTO display filter fields can be found in the display filter reference

Show only the SIMULCRYPT based traffic:

 simulcrypt 

Capture Filter

You can directly filter SIMULCRYPT protocols while capturing if you know the TCP port used (see above).

Capture only the SIMULCRYPT traffic over the chosen port (<port>):

 tcp port <port> 

External links

• http://pda.etsi.org/pda/queryform.asp ETSI TS 103 197 V1.5.1 (2008-10) - Digital Video Broadcasting (DVB);Head-end implementation of DVB SimulCrypt, latest version.

• http://pda.etsi.org/pda/queryform.asp ETSI TS 101 197-1 V1.1.1 (1997-06) - Digital Video Broadcasting (DVB);DVB SimulCrypt;Part 1: Head-end architecture and synchronization

• http://www.dvb.org/technology/standards/index.xml#conditional List of DVB standards relating to Conditional Access - various standards

• http://fr.wikipedia.org/wiki/Simulcrypt Wikipedia entry - currently only in French

Discussion

Imported from https://wiki.wireshark.org/SIMULCRYPT on 2020-08-11 23:24:43 UTC