| 摘要 |
A system that authenticates a user on a computer system. During operation, the system receives an authentication request from the user. Next, the system receives a first multimedia data item from the user. The system then performs a transformation on the first multimedia data item. Next, the system determines if the transformation of the first multimedia data item matches authentication data for the user, wherein the authentication data for the user is a transformation of a second multimedia data item. If so, the system authenticates the user.
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