Subject: Re: Forging Attack on COBRA From: COBRA Date: Fri, 28 Mar 2014 13:21:45 +0100 To: crypto-competitions@googlegroups.com Message-ID: <58597a3b62148de3bddad7f9b06d1353@esat.kuleuven.be> User-Agent: ESAT webmail service, powered by Roundcube Dear all, Many thanks to Mridul Nandi for looking into COBRA and for finding this clever attack. In the meantime, we found a solution, at the cost of efficiency, to this subtle oversight in COBRA and its proof. Nevertheless, we think it is fair to withdraw COBRA from the competition. Best regards, The COBRA team.