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Re:BitTorrent Chat - Private instant messaging via secure, d... by Zash on Tuesday October 01, 2013 @09:03AM (#6475794)
It's a header with a version number and the ID of the receivers key that the message was encrypted with. Base64-decode and hexdump those messages and look for 54483646 (one of the subkeys of F8669BB7). The encrypted message is after that and would look random. The format is defined in http://tools.ietf.org/html/rfc4880

edit: It's not encrypted with the primary key, but one of the subkeys.

Re:BitTorrent Chat - Private instant messaging via secure, d... by IanCal on Tuesday October 01, 2013 @09:50AM (#6476087)
Interesting, thanks for the overview. I'll have a poke around the doc :) I've been meaning to look into more about how these things work. I understand the very high level stuff and the very low level (how to use the tools roughly and some of the maths behind it all) but not so much in-between.