Re(AC)t Reputation and Anonymous Credentials for Access Control (t=2)

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Presentation transcript:

Re(AC)t Reputation and Anonymous Credentials for Access Control (t=2) Project Group AG Codes & Cryptography Prof. Blömer

Authentication

Authentication (OpenID/OAuth) myTestAccount@google.com *******************

Authentication (OpenID/OAuth) Google vouches for our identity Service knows we have authorization Google shares specified data with the service (e.g., email address) User has control over what is shared Service is ensured validity of data ⇒ Authentication via trusted third party. … but has to be involved each time we authenticate … as long as we trust Google about this Goals: Decentralize authentication. Eliminate need for trust. Bonus: Enable user anonymity.

Authentication via Credentials ✔

Authentication via Credentials Properties: No third party involved in authentication. No trust required in credential issuer. No trust required in authenticator. User has option to stay anonymous. User chooses what information is revealed. Even if issuer and authenticator collaborate.

The Project Group

Our goals Anonymous Credential System Theory Implementation Efficient construction based on recent papers Want to add important features like revocation and identity escrow Techniques: Digital signatures, encryption, zero-knowledge proofs Implementation Java (preferably) We have Java implementation of elliptic curve groups etc. Need software support for interactive protocols Need API, GUI, and scheme implementation Reputation System (optional)

What we offer Meaningful project: Will be used (SFB 901 testbed implementation) Will be published (open source project) Challenges in both theory and practice Set your own focus Insights into modern crypto

Prerequisites For theory: basic probability theory, basic algebra For practice: Java Nice to have: Introduction to Cryptography All „advanced basics“ will be covered in the seminar phase.

Thanks!