Cryptographic communication method in communication system

Cryptography – Communication system using cryptography – Symmetric key cryptography

Reexamination Certificate

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Details

C380S255000, C380S277000, C380S042000, C380S037000

Reexamination Certificate

active

07400730

ABSTRACT:
An RNC server issues an encryption start instruction to a media gateway (MG) and a terminal. The MG and terminal, which have received the encryption start instruction, encrypt U-Plane information using a predetermined secret key, and adds a predetermined encryption start bit to the encrypted U-Plane information for transmission to a communication partner. The communication partner, upon detection of the encryption start information, decrypts the received U-Plane information using the predetermined secret key.

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United Kingdom Search Report dated Sep. 29, 2004.
DoCoMo Techical Journal, vol. 9, No. 1, pp. 61-79.

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