Questions used as security checks on websites need to be replaced by more complex tests to establish a person's identity, say researchers. A study has shown how easy it is to guess the answer to common questions, such as someone's mother's maiden name. It found attackers will be able to break into 1 in 80 accounts if they get three chances to guess answers. "The numbers were worse than we thought," said Joseph Bonneau, the lead researcher on the study.

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