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Subject: RE: [Fwd: [emergency] Questions on ASN.1 and IPAWS Profile / CAP 1.2]
> -----Original Message----- > From: Jacob Westfall [mailto:jake@jpw.biz] > Sent: Wednesday, December 23, 2009 09:46 > To: rexb@starbourne.com > Cc: tony@yaanatech.com; TIMOTHY.D.GILMORE@saic.com; > emergency@lists.oasis-open.org; MARTENA.M.GOOCH@saic.com; > olivier.dubuisson@orange-ftgroup.com; ejones@warningsystems.com > Subject: Re: [Fwd: [emergency] Questions on ASN.1 and IPAWS > Profile / CAP 1.2] > > > representation of CAP 1.1 was. That was why I said that > this was the > > "first time I heard ASN.1 encoded CAP messages in relation to any > > US-specific implementation..." > > I too have not heard of any US specific implementation, but > I've also not heard of any European ones either :) Actually > outside of the H.323 work is anyone else aware of CAP ASN.1 > implementations, it would be good to know as a reference and > to get their feedback on any problems and areas of improvement. > > The original question I believe was regarding XML to ASN.1 > translations and the IPAWS Profile. While the IPAWS Profile > doesn't have any explicit references to ASN.1, it also > doesn't contain anything specific to XML only, and there > should be nothing that prevents ASN.1 encodings of IPAWS > Profile messages. I have little experience with ASN.1 > however and would certainly be willing to work with anyone > who has ASN.1 expertise to test and prove this. > > Regarding XML to ASN.1 translations, while it should be > possible, there is a concern here. One of the major reasons > for CAP 1.2 was correcting the schema to include XML Digital > Signatures/Encryption. However DSig's don't translate over > into ASN.1. So if you were translating from XML to ASN.1 the > DSig will be lost and some other, probably transport related, > security mechanisms would be needed. Translating back to XML > from ASN.1 would be even more problematic as you would have > to resign the XML message for DSig, and if you were to > compare the original XML DSig to the translated XML DSig they > would not match. Again though, take my comments with a grain > of salt. I'd certainly like to see if there is someone with > ASN.1 expertise who would be willing to also test this out. I think it's unlikely, but not impossible, that a signature would survive a round-trip between XML and PER. Alessandro
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