On Tue, Jun 30, 2015 at 02:03:59AM +0200, Bjorn Kuiper wrote: > > > Wouldn't the mackey be the key that I can retrieve using otr_parse, > thus: > > > 8dfd40e19d32e778410200de0235a5787e294216 ? > > > > No, that's the MAC tag, not the MAC key. > > > > > Or would it be the mackey that I would retrieve when re-establishing a > > > new DH key and get it from the list of old mackeys? > > > > Indeed. There are two ways to get the MAC key. One is if you know the > > private part of a DH key, in which case you can use otr_sesskeys to get > it. > > The other is if you have a transcripts containing later messages that > contain > > this key as an "old mackey", which you get with otr_parse. > > > > - Ian > > So consider the attached private key pidgin file, the private key of __bob > would be "2E3342837ACFB215EF502845CB48BB724762B950"
You can't find the private DH key in any file; that would defeat the forward secrecy property of OTR. You've got the private DSA key there instead. > Thus running otr_modify as follows > -- > $ ./otr_modify.exe d4def44ed4178c84a693a14516d344b7917b23a2 alice bjorn 4 > ?OTR:AAMDJ9e+VvBOmUoAAAAAAQAAAAEAAADA/QzMtslPdMiwOhStWZG5HQ7h9tdpb9KpM7R57Gv > MHHGDbFH1VDc74L3OHJdRprso5ZLsaQK9Rx3s7ZFIh6ubbDvsm/HPUCoZGwe1fadGV7d/v9+Eyg/ > 0jnjh0lGVDIT+W6d5Ia0EmHIzS9G6hsAugpK9Pk370JTL0bSaJIyzWYeZamSo4+OwJcusmiKrfWC > 15KiqGKWn0v29UYCpjrrgIlTj96Wmgo0yCFg+IEbCpssK0uSRa33kyqQTnpLthBjqAAAAAAAAAAE > AAAAKSrXNbc4fKYnZctVOW6P8z1koqGmSqMqRM+1o18P3AAAAAA==. > MAC does not verify: wrong MAC key? So this is expected. -- Ian Goldberg Associate Professor and University Research Chair Cheriton School of Computer Science University of Waterloo _______________________________________________ OTR-users mailing list OTR-users@lists.cypherpunks.ca http://lists.cypherpunks.ca/mailman/listinfo/otr-users
