open source digital cash packages

Are there any open source digital cash packages available? 
I need one
as part of another research project.


		--Steve Bellovin, http://www.cs.columbi
a.edu/~smb

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credlib provides Brands' and Chaum credentials, both of
which can be
used for ecash.

	http://www.cypher
space.org/credlib/

Adam

On Mon, Sep 17, 2007 at 01:46:04PM -0400, Steven M. Bellovin
wrote:
> Are there any open source digital cash packages
available?  I need one
> as part of another research project.
> 
> 
> 		--Steve Bellovin, http://www.cs.columbi
a.edu/~smb
> 
>
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Steven M. Bellovin wrote:
> Are there any open source digital cash packages
available?  I need one
> as part of another research project.


I can think of a few ways to answer this question.

1.  blinded money demo programs:  there is magic money, in C

and in Java.  Also I think Ben Laurie wrote another one 
demo'd at EFCE.  These demos are generally around 1-4kloc.

2.  hard money systems:  These allow you to actually issue 
money and survive aggressive communities.  epointsystem is 
GPL I think, Ricardo is something or other but I haven't the

energy to support the server side as an open source project.

  Ricardo is 100-150kloc, epointsystem is much smaller (and

lighter in features and scope).

3.  soft community money systems:  cyclos and similar (one 
from south africa, another from NZ from memory).  These 
products are designed for small communities where trust is 
implicit, they have no internal governance capabilities and

only limited external security exposures.  But you can use 
them to issue money.

4.  then there are other variants like barcode money.  A lot

of interest is being put into mobile phone money atm.

iang

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On Sun, Sep 23, 2007 at 01:32:51PM +0200, Ian G wrote:
> 1.  blinded money demo programs:  there is magic money,
in C and in Java.  
> Also I think Ben Laurie wrote another one demo'd at
EFCE.

The one by Ben Laurie is lucre:

http://anoncvs.
aldigital.co.uk/lucre/

-- 
Patroklos Argyroudis
http://ntrg.cs.tcd.ie/~a
rgp/

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Ian G wrote:
> 1.  blinded money demo programs:  there is magic money,
in C and in
> Java.  Also I think Ben Laurie wrote another one demo'd
at EFCE.  These
> demos are generally around 1-4kloc.

Lucre. There was also a project, lucrative, to make it into
a usable
platform. It fizzled, I think, but may still be a good
starting point.

Of course, Chaumian e-cash is now patent free. I think
there's another
confusingly-named (my fault, sorry) project that does that.
Called Lucre.

Cheers,

Ben.

-- 
http://www.apache-
ssl.org/ben.html           http://www.links.org/

"There is no limit to what a man can do or how far he
can go if he
doesn't mind who gets the credit." - Robert Woodruff

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