Transaction method between two entities providing anonymity revocation for tree-based schemes without trusted party

摘要

The invention proposes an off-line divisible e-cash scheme where a user can withdraw a divisible coin of monetary value n^L (n being for example equal to 2) that he can parceled and spend anonymously and unlinkably. The invention allows to protect the anonymity of honest users and to revoke anonymity only in case of cheat for protocols based on a tree structure without using a trusted third party.