摘要：

According to one embodiment, an apparatus may store a plurality of tokens that indicate a user is using a device to access a resource over a network. The apparatus may detect at least one token indicating a change associated with at least one of the device, the network, or the resource. The apparatus may then determine to re-authenticate the user in response to the change. The apparatus may then request a password generated using personal information of the user, and receive a re-authentication token comprising the password generated using personal information of the user. The apparatus may then request, from the user, a second password. The request for the second password may include instructions on how to form the second password. The apparatus may receive a response comprising the second password and determine that the second password matches the password. The apparatus may then re-authenticate the user.

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