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IP Multicast is an internet communication method where a single data packet can be transmitted from a sender and replicated to a set of receivers. The replication techniques are somewhat dependent upon the media used to transmit the data. Transmission of multicast on an inherent broadcast media such as Ethernet or a satellite link automatically allows the data packet to be received by all the receivers directly attached to the media. In contrast, transmission of multicast on media that is point-to-point or point-to-multipoint requires the packet to be replicated for each link. The replication process should occur in an optimal manner where a distribution tree is built within the network. The packet can be replicated at each of the branches in the tree. This mitigates the requirement for the sender to replicate the packet once for each recipient. The use of IPsec as a communication link requires a point-to-point connection establishment. Usually, the security is required from sender to receiver which implies the sender must replicate the packet on each of the secure connections - one for each receiver.
A method for securing multicast communications
The application discloses a multicast communication security guarantee method, comprising the following steps: a multicast sender periodically sends multicast messages; after a receiver receives the multicast messages, if there is no security check requirement for the received information, the receiver directly uses a security code to check the message integrity, directly uses the message after checking the message disorder, deletion and repetition according to a time stamp and a serial number; and if there is a security check requirement for the received information, the receiver performs security check, including verifying a security signature by using a pre-configured encryption algorithm and key, checking the message integrity, disorder, deletion and repetition, and performing delay check. The application can save communication bandwidth, reduce the number of links and simplify link management based on multicast mechanism transmission of security information.
Owner:浙江众合科技股份有限公司