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Comment: Whether the protocol preference is set is irrelevant to whether a capture filter will work.
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(XXX add links to preference settings affecting how PROTO is dissected). There are some [[SIMULCRYPT_Preferences]].

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).


XXX - add a brief description of PROTO history

Protocol dependencies

  • TCP: For the SCS to ECMG, SIMULCRYPT 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).

Example traffic

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


The SIMULCRYPT dissector is fully functional for the SCS - ECMG interface. It decodes the Simulcrypt syntax to analyse different Simulcrypt messages and associated TLV parameters.

Preference Settings

There are some SIMULCRYPT_Preferences.

Example capture file

Display Filter

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

  • Show only the SIMULCRYPT based traffic:


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> 


SIMULCRYPT (last edited 2010-10-05 19:07:27 by GuyHarris)