| 摘要 |
A method for securing transmission of streaming media by encrypting each packet (25) in the stream with a packet key (21) using a fast encryption algorithm (6). The packet key (21) is a hash (5) of the packet tag value (24) and a closed key (22) which is unique for each stream. The closed key (22) is itself encrypted by the sender and passed to the recipient using a public key encryption system (2, 3, 11, 12). The encrypted closed key (23) may conveniently be inserted (27) into the stream header. All of the packets in the stream (29) are encrypted, but only the data pay load (25) of each packet is encrypted. It is computationally infeasible, without knowing the recipient's private key (11) to calculate the closed key (22) based upon knowledge of publicly accessible information such as the recipient's public key (2), the open key (23), the encrypted stream data (29) or the packet tag values (24). <IMAGE> |
