Attribute-based Credentials for Trust: Identity in the by Kai Rannenberg, Jan Camenisch, Ahmad Sabouri

By Kai Rannenberg, Jan Camenisch, Ahmad Sabouri

The desire for info privateness and defense maintains to develop and will get more and more well-known. during this regard, Privacy-preserving Attribute-based Credentials (Privacy-ABCs) are dependent suggestions to supply safe but privacy-respecting entry keep watch over. This booklet addresses the federation and interchangeability of Privacy-ABC applied sciences. It defines a standard, unified structure for Privacy-ABC structures that enables their respective gains to be in comparison and mixed additional, this e-book offers open reference implementations of chosen Privacy-ABC structures and explains tips on how to install them in genuine construction pilots, permitting provably approved participants of constrained groups to supply nameless suggestions on their group or its individuals. to this point, credentials equivalent to digitally signed items of non-public details or different info used to authenticate or determine a person haven't been designed to recognize the clients’ privateness. They necessarily display the id of the holder even supposing the applying handy frequently wishes less details, e.g. purely the affirmation that the holder is or is eligible for social advantages. against this, Privacy-ABCs enable their holders to bare simply their minimum info required through the functions, with out freely giving their complete identification info. Privacy-ABCs therefore facilitate the implementation of a reliable and even as privacy-respecting electronic society.

The ABC4Trust undertaking as a multidisciplinary and eu venture, provides a technological reaction to questions associated with info protection.

Viviane Reding
(Former Vice-president of the ecu fee, Member of ecu Parliament)

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Finally, the inspection grounds are clear to the user at the time of presentation and are “signed” into the token, so that they cannot be modified afterwards. This prevents a malicious verifier from requesting a presentation token to be inspected based on different grounds than those that the user agreed with. 6 Revocation When a credential is used in a presentation token with issuer-driven or verifierdriven revocation, the user merely proves that his revocation handle, respectively his combination of attribute values, was not revoked when the revocation authority published the stated revocation information.

De-anonymization of presentation tokens is probably the main use case for inspection, but it can also be used to reveal useful attribute values to third parties instead of to the verifier himself. For example, suppose the verifier is an online merchant wishing to accept credit card payments without running the risk of having the stored credit card data stolen by hackers. In that case, he can make the user encrypt her credit card number under the public key of the bank by specifying the bank as an inspector for the credit card number with “payment” as inspection grounds.

It also means that presentation tokens are unlinkable, in the sense that even a collusion of issuers and verifiers cannot tell whether two presentation tokens were created by the same user or by different users, and cannot trace the presentation back to the issuance of the credentials. Of course, unlinkability is only guaranteed to the extent that neither the disclosed attributes themselves nor the communication layer introduce trivial correlations between a user’s presentations. , using Tor onion routing, to avoid that the verifier can link visits by the same user through his IP address.

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