A Formal Logic Framework for Receipt-freeness in Internet Voting Protocol

The practical Internet voting protocols should have: privacy, completeness, soundness, unreusability, fairness, eligibility, and invariableness, universal verifiability, receipt-freeness, coercion-resistant. Receiptfreeness is a key property. Receipt-freeness means that the voter can't produce a receipt to prove that he votes a special ballot. Its purpose is to protect against vote buying. Formal method is an important tool to assess receipt-freeness of Internet voting protocols. In this paper we give a formal logic framework for receipt-freeness based on V. Kessler and H. Neumann logic. The framework is then applied to analyze receipt-freeness of two typical voting protocols: FOO and Meng Internet voting protocol.