Patent ID: 8547205

Claim:
A pre-shared key based anonymous authentication method, comprising: sending, by a reader-writer to an electronic tag, an access authentication request packet, wherein the access authentication request packet comprises: a random number N 1 selected by the reader-writer; authenticating, by the reader-writer, an access authentication response packet after receiving the access authentication response packet sent from the electronic tag, and building an access authentication confirmation packet if the authentication succeeds, wherein the access authentication response packet comprises: a temporary identity TempID of the electronic tag; the random number N 1 selected by the reader-writer; a random number N 2 selected by the electronic tag; and a message integrity check code MIC calculated by the electronic tag and having the value H (TempID∥N 1 ∥N 2 ∥Key); sending, by the reader-writer to the electronic tag, the access authentication confirmation packet.