Cryptology ePrint Archive: Report 2014/629

Available versions in chronological order

20140820:185653 (posted 20-Aug-2014 18:56:53 UTC): Realizing two-factor authentication for the Bitcoin protocol; Christopher Mann and Daniel Loebenberger
20141104:132246 (posted 04-Nov-2014 13:22:46 UTC): Two-factor authentication for the Bitcoin protocol; Christopher Mann and Daniel Loebenberger

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