| 主权项 |
1. A method comprising:
receiving an identifier of a user; obtaining a plurality of prompts using the identifier, wherein a first prompt corresponds to a first character of an access code and a first alternative, a second prompt corresponds to a second character of the access code and the first alternative, a third prompt corresponds to the first character of the access code and a second alternative, and a fourth prompt corresponds to the second character of the access code and the second alternative; causing the first prompt to be presented on a display at a first time, wherein a location of the first prompt on the display corresponds to the first alternative; causing the third prompt to be presented on the display at the first time, wherein a location of the third prompt corresponds to the second alternative; causing the second prompt to be presented on the display at a second time, wherein a location of the second prompt corresponds to the first alternative; causing the fourth prompt to be presented on the display at the second time, wherein a location of the fourth prompt corresponds to the second alternative; receiving an audio signal comprising speech spoken by a user; and determining whether the audio signal comprises the user speaking the first prompt followed by the second prompt. |
