| 摘要 |
An improved method is provided for generating an authentication factor for authenticating a user. The method includes: assigning a unique identifier to a user of the computing resource; determining a value for a challenge to the user, where the value is determined by a random determination method; concatenating the identifier with the value to form an input string; encrypting the input string using a one-way hash function to yield an output string of characters; and selecting a subset of characters from the output string to serve as the authentication factor for the user. This improved method may be used to generate grids used in a grid authentication scheme.
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