AUTHENTICATION METHOD AND DEVICE

摘要

The present invention provides an authentication method and device. The method includes: obtaining a first key generated after subscription authentication and obtaining a second key generated after platform authentication; and carrying out key deduction so as to obtain a third key according to the first key and the second key, and deducing an NAS key and an AS root key according to the third key, wherein the NAS key is used for protecting an NAS message, the AS root key is used for deducing an AS key and the AS key is used for protecting an AS message and data. The embodiments of the present invention can improve the security protection ability.