One-time packet key exchange scheme for secure real-time multimedia applications

• We propose a selective one-time packet key encryption scheme.
• Real-time key exchange is applied to the selected RTP packets.
• We solve the timely use of the packet keys for real-time multimedia applications.
• The encryption rate can be reduced to 17.5% while satisfying strong security.

To secure multimedia communications, existing encryption techniques usually encrypt the whole data stream using the same session key during a session. The use of the session key confronts with tradeoff problem between session key creation latency and security for the real-time multimedia stream. The main feature of our proposed scheme is to selectively encrypt RTP packets using different one-time packet keys in the same session for real-time multimedia applications. The packet key, which has already been used, will never be reused throughout the same session. The use of the one-time packet key enables to improve security strength of real-time multimedia. To solve the issue of the real-time packet key exchanges related to the timely use of the one-time packet keys, this paper suggests the one-time packet key exchange method that does not need to occur on a packet-by-packet basis.