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All about the most recent compression techniques, algorithms, patents, products, tools and events.

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Recent Posts

  • Google Snaps Up On2 (3 Comments)

  • Bijective BWT (28 Comments)

    David Scott has written a bijective BWT transform, which brings all the advantages of bijectiveness to BWT based compressors. Among other things, making BWT more suitable for compression-before-encryption and also give (slightly) better compression.

  • Asymmetric Binary System (169 Comments)

    Jarek Duda’s “Asymmetric Binary System” promises to be an alternate to arithmetic coding, having all the advantages, but being much simpler. Matt has coded a PAQ based compressor using ABS for back-end encoding. Update: Andrew Polar has written an alternate implementation of ABS.

  • Precomp: More Compression for your Compressed Files (5 Comments)

    So many of today’s files are already compressed (using old, outdated algorithms) that newer algorithms don’t even get a chance to touch them. Christian Schneider’s Precomp comes to rescue by undoing the harm.

  • On2 Technologies is Hiring

    There aren’t too many companies working on cutting edge codecs, and of those few this one is hiring. Best of luck.

JPEG2000 Security Standard, JPSEC

Posted by Sachin Garg on 6th May 2007 | Permanent Link

At her blog, HP’s Susie Wee gives some insight on newly approved Part-8 of Jpeg2000 standard which deals with, among other things, intelligent encryption of Jpeg 2000 files.

Susie has been working on media security for scalable media for some years now, and is a co-editor of the JPSEC standard.

In short, the multitude of progressive/scalability options that JPEG 2000 provides (which are the formats real strength) will disappear on encrypting the entire compressed streams as a whole. The solution lies in providing a format aware standard which can look through Jpeg2000’s tiles/layers/packets/etc to encrypt just those parts so that a server can still process all different progressive requests without having to go through the entire encode/decode cycle. The standard also specifies the signaling data that must be included in the protected bitstream to allow the protected subsets of data to be extracted.

In Susie’s words, “simultaneously allowing mid-network transcoding and end-to-end security”.