credlib - Credential Library

The library code and binaries can be found here.

I have included linux and windows binaries in the .tgz and .zip respectively for convenience. If you use the -p option, the program prints bc format operations and numbers so you can check things and follow along using the bc interpreter. You will need a bc modular arithmetic library such as this one by Anton Stiglic to do that.

credlib so far implements just the basic Brand credential features: issuing, showing with 0 to many attributes.

Note: Brands credentials are patented, so I want to clarify, this library does not confer any kind of patent rights. For those you need to contact Dr Stefan Brands at credentica.com. My understanding therefore is you can use this library for academic use only.

Implemented by Dr Adam Back.

Other resources

• credentica has an online copy of Dr Stefan Brands PhD thesis on his credential system Rethinking Public Key Infrastructures and Digital Certificates; Building in Privacy, MIT Press, 2000, Dr Stefan Brands
• a document I found useful while implementing the above library is this paper A Technical Overview of Digital Credentials, Technical Report, February 2002, Dr Stefan Brands.
• another technical summary paper A Description of Protocols for Private Credentials, Zero-Knowledge Systems Inc, Technical Report, June 2001, Ariel Glenn, Dr Ian Goldberg, Frederic Legare, Anton Stiglic
• Stefans company credentica.com has a java library called U-prove that implements more of the features of Brands credentials than my credlib library.