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Subject: Re: Interim requirements
Phill, That link didn't work in NS (not sure if its me or it). In any case, you also need to add some requirements text about avoiding replay attacks - for the core stuff I guess we just want some "freshness" attribute which can handled via MUST/SHOULD/MAY depending on the use case, protocol & bindings. (Jumping right ahead to how to meet the requirement:-) I think the idea of doing this as an XML-DSIG SignatureProperty has been raised as a generic solution. Stephen. Philip Hallam-Baker wrote: > > OK time to switch to html folks! > > I have re-edited Nigel's proposal, the purpose of the ESA requirements > analysis is to make very sharp distinctions between requirements and > architecture. Essentially anything up to the word 'because' in is by > definition not a requirement. What comes after 'because' is the requirement. > > I have split Nigels proposals into two and suggested two alternative > approaches to meeting the protocol efficiency requirement. > > I am also going through the S2ML and AuthXML drafts to reverse engineer > requirements from the architecture. The idea of ESA requirements analysis is > that the document that comes out the end is a nice 'waterfall' document that > proceeds from requirements, constraints, architectural specification to > arrive at implementation specification. > > In practice however everyone does the process backwards because that is how > the brain is designed to think (abstracting particulars to ideals) rather > than reason (ideals to particulars). > > Phill > > ---------------------------------------------------------------------------------------------------- > Name: S2ML Requirements analysis.url > S2ML Requirements analysis.url Type: Internet Shortcut (application/x-unknown-content-type-InternetShortcut) > Encoding: BASE64 -- ____________________________________________________________ Stephen Farrell Baltimore Technologies, tel: (direct line) +353 1 881 6716 39 Parkgate Street, fax: +353 1 881 7000 Dublin 8. mailto:stephen.farrell@baltimore.ie Ireland http://www.baltimore.com
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