Dear Vincent, Aurelien and Faurite, My name is Lei Liang from University of surrey, UK. As my colleague Dr. Haitham Cruickshank talked with Vincent in the last IETF meeting, we are working on a new TESLA synchronization method while integrating with FLUTE, which is built on ALC, in a UK EPSRC project called Satellite-Based Secure Multicast employing Hybrid Reliability. We think your ID is definitely very interesting and we used it as a very important reference in our study. So you have our support here :). The new synchronization method we proposed is trying to eliminate the bidirectional channel requested by the direct synchronization as stated in the TESLA RFC because the ALC does not need it, especially in a satellite network. It is trying to take use of the FDT function in the FLUTE protocol to deliver the TESLA bootstrapping message and the information needed for synchronization. This can be achieved as long as the FDT is periodically broadcasted or mulicasted to a well-known address. This synchronization information is not a strong overhead but the interval index in which the source is when sending the bootstrapping message. It can also solve the scalability problem on the source when the multicast group is big. We published our initial study in ICC'2008 and are implementing and validating the method now. Please find the enclosed pdf version of the paper that has the detailed description. I hope it can provide some useful thought for your ID and your comments are more than welcome. Best regards, Lei Liang
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