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   Re: [xml-dev] Slides from "Web Services Security Issues"

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Bullard, Claude L (Len) wrote:
> Does encryption and digital signing increase the need for bandwidth or
> the need for CPU power and battery life?  Of those, the second one
> seems to be the harder problem.

About 5-6 years ago, there was an interesting comparison of the size of a binary
EDI (CEFACT) message versus the same transaction using an XML/EDI document.  The
size difference was about 1K (EDI) versus 11K (XML/EDI). For a single
transaction, the "XML overhead" was about 10K. Bandwidth and disk storage were
comparatively more expensive than MIPS, so economics favored using cheap CPU
cycles to compress documents.

Disk and bandwidth costs are lower today than in 1998. Compression seems less
important, but securing documents has become more important because we're using
them as the basis for critical services. We may not need to invest in MIPS for
compressing documents, but (in some cases) we need to do so to secure them using
digital signatures and encryption. Changes in the regulatory environment
(Sarbanes-Oxley, HIPAA, Basel II, SEC/NASD) are trending us towards securing
more data and document exchanges.

Increased bandwidth should increase the requirement for CPU power and content
processing applicances. If you go from exchanging X documents per day to
exchanging 1000X, you'll need more MIPS for message queuing, encryption,
decryption, and so on.


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