[sword-devel] Open book unlocking system (was Re: Module verification, was Re:
[sword-devel] DoctrinalStatement)
Paul Gear
sword-devel@crosswire.org
Sun, 30 Jul 2000 12:53:58 +1000
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Chris Little wrote:
>...
> I think some kind of signing system is needed, possibly built into the
> module format itself. It may be time to update the sword module format to
> include some new features. Perhaps all modules should be encrypted such
> that they are only properly readable if they are unaltered, something like
> using their own checksum as an encryption key.
>
> We might also add a message to the various frontends that would popup if
> non-Crosswire-sanctioned modules were loaded in, similar to Larry P's
> popups in OLB. Or we could warn that possibly tampered-with files are
> being loaded.
> ...
Jerry Hastings wrote:
>
> At 06:23 PM 7/28/2000 +1000, Paul Gear wrote:
> >Jerry Hastings wrote:
> > > ...
> > > I would like to see a program for identifying, comparing and certifying
> > > texts. A site could list data about texts, such as, CRCs, file sizes,
> > > number of words, etc.. A program could check a local text against the
> > > online stats for a "certified" file. That could help people to also know if
> > > they have the latest and most correct version. I would also like to take
> > > files of different formats, but claiming to be the same text and compare
> > > any differences. One software publisher may have found and corrected
> > > errors, even typos and OCR errors, that others do not know about.
> >
> >All of that should be built into the module format, not a manual
> >process.
>
> All of that? I would like to see some security features built into the
> modules, too. But, I don't have complete confidence in built in security.
> Also, I am not interested in just the Sword. I would like to compare texts
> from different programs and see if there are differences. I would like to
> also see people publishing any such info as it is discovered. Such as
> errors in texts and how to tell if you have a version with the errors and
> is there an update/correction. Not just for Sword's sake.
>
> I am interested in the specifics of what you were thinking. Can you do all
> that in the module format?
Glad you asked, Jerry. :-) I've been thinking about this issue for
some time. I started to prepare a long and involved message about how i
envisaged it working, but i realised that it would probably prove
incomprehensible to just about everyone but me. So let me give a brief
overview, and we can go into more detail later.
It seems to me that there are several problems we could solve with one
piece of technology:
1. Encrypted modules.
2. Verification of modules.
3. Point-of-sale type unlocking with which commercial publishers
would be happy.
The technology i'm thinking of here is OpenSSL, the free software
library for implementing X.509 PKI functionality.
Here is an overview of the components of my proposed solution:
1. Modules are encrypted using a single key, by a symmetric cipher (as
they are now), preferably with a fairly small key length, for
performance reasons. (What length do we use at the moment?)
2. Modules are signed with the distributor's digital signature. This
allows module verification with cryptographic checksums. A root
certificate authority key would need to be embedded in the software
distributions (like Netscape and IE do). More detailed verification
parameters (as suggested above by Jerry) could be added to the
certificate to verify the text if the checksum verification fails.
3. Unlocking a book involves creating an SSL connection to an unlock
server, generating a one-time asymmetric key at the client, and the
server encrypting the module's symmetric key to that asymmetric key.
The application stores this asymmetrically encrypted version of the
module key.
4. Reading a locked book involves decrypting the module key and using
it to decrypt the book.
What this would require of application software:
1. Embedded keys for the root certificate authorities. We could use
existing ones on the Internet, or create our own, which would be cheaper
(i.e. free :-).
2. Linking with OpenSSL to do module checksumming and decryption.
3. Code to generate, save, and restore unlock keys.
4. User interface hooks for: viewing certificates, verifying modules,
and unlocking books.
5. Client-server code for talking to the server during module
unlocking. There would need to be a way of allowing manual web or phone
unlocks as well.
There are some problems with this proposal, one being that there is no
obscurity, so anybody with the know-how would be able to write a program
to decrypt the modules using OpenSSL. I have a few ideas for overcoming
this, but it needs to be something which does not compromise our
commitment to GPL-ed code.
The other problem is who is going to do it? This would be a rather
large undertaking. I would love to do it, but i don't have the time. I
would jump at the chance to quit my job to work on this sort of stuff,
but who would pay for it? Know anyone who'd like to invest a bit of
venture capital? 8^)
I've copied this to Bob@Logos (although hopefully your mail filters
would have flagged this message anyway, Bob :-) and Bible-Linux, hoping
that others might be interested in working on a standard that we could
all use. Are there others who we could get together with on this?
Maybe the guys at Theophilos?
I know Logos already has a system to do all of this, Bob, but it is a
possible solution for working together with us (as we discussed some
time ago on the Bible-Linux list), and it would allow you to upgrade to
a system using real encryption. (Of course, you could do that anyway,
but it would be nice if we could do something together. ;-)
Well, what think ye?
Paul
---------
"He must become greater; i must become less." - John 3:30
http://www.bigfoot.com/~paulgear
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