| _PR<sub>5</sub>_ - Unlinkability of EV Users and Locations | [daa_pnc_anonymity_ev_users_locations.spthy](Privacy_Properties/daa_pnc_anonymity_ev_users_locations.spthy) <br>[daa_pnc_unlinkability_ev_users_locations.spthy](Privacy_Properties/daa_pnc_unlinkability_ev_users_locations.spthy) | [ObsEquOracle_ev_users_locations.py](Privacy_Properties/ObsEquOracle_ev_users_locations.py) |
## Original Tamarin DAA model
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@@ -39,7 +38,7 @@ Our models are based on the models from the following paper:
Stephan Wesemeyer, Christopher J.P. Newton, Helen Treharne, Liqun Chen, Ralf Sasse, and Jorden Whitefield. 2020. Formal Analysis and Implementation of a TPM 2.0-based Direct Anonymous Attestation Scheme. In Proceedings of the 15th ACM Asia Conference on Computer and Communications Security (ASIA CCS '20). Association for Computing Machinery, New York, NY, USA, 784–798. DOI:https://doi.org/10.1145/3320269.3372197
Their Tamarin models can be found at https://github.com/tamarin-prover/tamarin-prover/tree/dddaccbe981343dde1a321ce0c908585d4525918/examples/asiaccs20-eccDAA.
Their Tamarin models can be found at https://github.com/tamarin-prover/tamarin-prover/tree/dddaccbe981343dde1a321ce0c908585d4525918/examples/asiaccs20-eccDAA.
The changes/extension to their model can be summarized as follows: (i) Adaptions/additions to the model rules in order to represent the e-mobility-specific roles/processes within the context (e.g., the introduction of the CPS role between the host and issuer in the credential provisioning process or the validation of charge authorization via the EMSP in addition to the DAA-Signature verification by the CP/Verifier), (ii) changes to model rules in order to represent the changes to the base DAA Join and Certify processes; e.g., the possibility of no live interaction with the credential issuer during installation due to the use of credential pools or the binding of session keys to the ISO 15118 session), (iii) definition of new lemmas in order to verify correctness as well as the identified security/privacy requirements, and (iv) performance optimizations such that the new models terminate within a reasonable time frame via the adaption of oracles (to work with the new/changed rules) and the addition of source/reuse lemmas.
Our changes roughly amount to 54 new rules, 16 changed rules, 32 new lemmas, 18 changed lemmas, and 5 adapted oracles.
