Encrypting communications between wireless mobile units
A wireless mobile unit includes a voice encoder circuit that receives an analog voice signal and creates digital voice data representing a user's voice.an encryption key entered by the user on the keypad or through a voice recognition circuit is received by the mobile unit and is stored in a storage device. the digital voice data is encrypted by an encryption circuit using the encryption key. A transmitter then modulates the encrypted voice data onto an RF signal and transmits the RF signal to a base station in a wireless network.the same encryption key is used by the base station to decrypt the signal before transmitting it to another base station or mobile unit.Signals transmitted from the base station to the mobile unit are encrypted and decrypted using a user-selected encryption key in a similar manner.

[attachment=3648]


For more details and descriptions, visit this link:
http://freepatentsonline6792112.html