- ISMACryp
The ISMA 1.1 Encryption and Authentication specification (or ISMACryp) specifies encryption and message authentication services for
MPEG-4 overRTP streams.There are two alternatives to ISMACryp,
SRTP andIPsec , that can also be used to provide service and content protection. The difference between the three is at what level encryption is done. Whereas ISMACryp encrypts MPEG-4 access units (that are in the RTP payload), SRTP encrypts the whole RTP payload, and IPsec encrypts packets at network level.Doug Lowther , "Mobile TV, from hype to reality", 2007 [http://www.irdeto.com/images/uploads/TheAgendaSetter2007.pdf] ]The ISMACryp specification does not mandate a cipher but
AES in Counter Mode, the default encryption and authenticationtransform in the specification, is the de facto cipher used by ISMACryp implementations.ee also
* RTP
*SRTP
*IPsec Notes
External links
* [http://www.isma.tv/specreq.nsf/SpecRequest ISMA Encryption and Authentication Version 1.1]
* [http://www.videsignline.com/howto/showArticle.jhtml?articleId=196801482 DVB-H handheld video content protection with ISMA Encryption]
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