Dual authentications utilizing secure token chains

摘要

Embodiments include a method and a system of authenticating a client when the client logs in a servicing. According to one embodiment, a first authentication code and a second authentication code is submitted from the client to the servicing server. The second authentication code includes a secure token of a reversal secure token chain with a hash function and an index of the secure token in the reversal secure token chain. The first authentication code is then verified at the servicing server. The secure token is also verified at the servicing server by comparing a hash value of the secure token with a previously acquired secure token or a root of the reversal secure token chain. If the first authentication code and the second authentication code are associated, the login is confirmed.