Re: open source digital cash packages

2007-09-23 Thread Ian G

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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Re: open source digital cash packages

2007-09-23 Thread Ben Laurie
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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Re: open source digital cash packages

2007-09-18 Thread Adam Back
credlib provides Brands' and Chaum credentials, both of which can be
used for ecash.

http://www.cypherspace.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.columbia.edu/~smb
 
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open source digital cash packages

2007-09-17 Thread Steven M. Bellovin
Are there any open source digital cash packages available?  I need one
as part of another research project.


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

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