Method and apparatus for protecting cordless telephone account authentication information.

摘要

The present invention provides an apparatus for use in a telecommunication system which includes a local unit such as a cordless telephone handset and a remote unit. The apparatus generates an encrypted confirmation in the local unit in response to an inquiry received from the remote unit. The apparatus comprises receiving means for receiving the inquiry; memory means for storing a scrambled encryption key; descrambling means operatively coupled with the memory means for receiving the scrambled encryption key and for descrambling the scrambled encryption key responsive to a first predetermined digital code to produce a descrambled encryption key; and encryption means for generating an encrypted confirmation in response to the inquiry, the encrypted confirmation being encrypted using the descrambled encryption key. The invention further includes a code means such as a fuse bank for establishing the first predetermined digital code.