[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Slides from "Web Services Security Issues"
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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