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The '''ISMA Encryption and Authentication, Version 1.1''' specification (or '''ISMACryp''') specifies [[encryption]] and message [[authentication]] services for [[MPEG-4]] over [[Real-time Transport Protocol|RTP]] streams. It was defined by the [[Internet Streaming Media Alliance]] and published on September 15, 2006.

The '''ISMA Encryption and Authentication, Version 2.0''' specifies content encryption, message authentication (integrity) services, an RTP payload
format and a file format for pre-encrypted content for ISMA 1.0, ISMA 2.0 and more generally any media that can be stored as [[elementary stream]] in an [[ISO base media file format]] (ISO/IEC 14496-12). The specification was published on 15 November 2007. ISMACryp specification defined extensions over the ISO base media file format, which were registered by the registration authority for code-points in "[[MP4]] Family" files. The ISMACryp 2.0 specification in an informative "Annex F" provides guidelines on how ISMACryp can be used together with the key and rights management system of [[OMA DRM]] v2 ([[Open Mobile Alliance]] [[Digital rights management|DRM]]). The Packetized OMA DRM Content Format is almost based on ISMACryp format.<ref name="isma2" />

There are two alternatives to ISMACryp, [[Secure Real-time Transport Protocol|SRTP]] and [[IPsec]], 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 .

==Source==

[http://wikipedia.org/ http://wikipedia.org/]
[[Category:Cryptographic algorithms]]
[[Category:Cryptography]]

ISMACryp - Revision history

Admin: Created page with "The '''ISMA Encryption and Authentication, Version 1.1''' specification (or '''ISMACryp''') specifies encryption and message authentication services for MPEG-4 ove..."