Anonymous Server-Aided Verification

Server-Aided Verification (SAV) is a method that can be employed to speed up the process of verifying signatures by letting the verifier outsource part of its computation load to a third party. Achieving fast and reliable verification under the presence of an untrusted server is an attractive goal in cloud computing and internet of things scenarios.In this talk I will describe a simple and powerful framework for SAV and present a security model that refines existing while covering the new notions of SAV-anonymity and extended unforgeability. In addition, I will present the first generic transformation from any signature scheme to a single-round SAV scheme that incorporates verifiable computation."Automated verification of privacy-type properties for security protocols"par Ivan Gazeau (LORIA, Inria Nancy)Date : 16 mars 2018Lieu : Salles Petri/TuringThe applied pi-calculus is a powerful framework to model protocols and to define security properties. In this symbolic model, it is possible to verify automatically complex security properties such as strong secrecy, anonymity and unlinkability properties which are based on equivalence of processes.In this talk, we will see an overview of a verification method used by a tool, Akiss. The tool is able to handle 
- a wide range of cryptographic primitives (in particular AKISS is the only tool able to verify equivalence properties for protocols that use xor); 
- protocols with else branches (the treatment of disequalities is often complicated). 
We will also provide some insights on how interleaving due to concurrency can be effectively handled."