[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: md5sum / sha1sum for XML?
Hi Mitch. On Fri, 2006-07-14 at 17:14 -0400, Mitch Amiano wrote: > An encrypted file need not be signed at all, and a signed file need not > be encrypted. > The two things - signing and encrypting - are distinct operations. Yes. I'm happy with that. > One you do to ensure no one can read the data that shouldn't be reading it. > The other you do to ensure that no one has tampered with data that > shouldn't be tampered with, while not necessarily encumbering the > ability to read it. I'd like both, hence the need to get them in the right order! After finding out that Sun (Solaris?) uses tail +386 rather than tail -n +386, I've finally managed to install their jwsdp package (grrr), so I'm hoping today to have a play with dig-sigs. I'm not even sure which jar files the crypto stuff is in as yet, but I'll chase it down. > > Now, I'm not a security expert. Someone with more experience in this > area may correct me on this, and could speak to the issue a bit more > practically. > > But encryption alone is insufficient. One reason is that someone might > well encrypt another file and substitute it for your original encrypted > package. With a signature, both you and the receiver can perform a > subsequent test that the signature and file still match up. Of course, > if the signature is also with the original data, and that's your only > copy, then someone could replace the signature too. Even if not, you or > the receiver could conceivably maliciously replace both the file and > the signature, thus creating an uncertainty about whose copy is authentic. For our application I'm moderately confident of such maliciousness being absent. I'm trying to find a balance between caution and paranoia. -- Regards, Dave Pawson XSLT + Docbook FAQ http://www.dpawson.co.uk
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