Patent ID: 6028937
Filing Date: 2000-02-22
Classification: G06Q,H04L

Abstract:
A communication apparatus for performing two-way authentication in challenge response format with another communication apparatus on a communication channel, the communication apparatus comprising:first authentication key storage means for storing a first authentication key which is only provided to authorized communication apparatuses;first data converting means for performing a data conversion determined by the first authentication key, the data conversion being based only on a single algorithm, wherein an inverse conversion for the data conversion exists and subjecting a plaintext to the data conversion and the inverse conversion in any order restores the plaintext to an original form;authenticating means for authenticating the other communication apparatus using communication in the challenge response format and the data conversion performed by the first data converting means; andproving means for proving an authorization of a present communication apparatus using communication in the challenge response format and the data conversion performed by the first data converting means.