| 摘要 |
A modem ( 10 ) includes a locking module ( 100 ), a bandwidth selection module ( 220 ), and an authentication module ( 300 ). The locking module locks a bandwidth. The bandwidth selection module determines whether the locked bandwidth is a predefined bandwidth, and selects a type of certificate from a plurality of types of certificates according to the determined result. The authentication module employs the selected type of certificate for authentication. A certificate selection method thereof is also provided.
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