Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WNpzQ-00077f-Mi for bitcoin-development@lists.sourceforge.net; Wed, 12 Mar 2014 20:43:00 +0000 X-ACL-Warn: Received: from mail-ee0-f41.google.com ([74.125.83.41]) by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1WNpzM-0001xP-S7 for bitcoin-development@lists.sourceforge.net; Wed, 12 Mar 2014 20:43:00 +0000 Received: by mail-ee0-f41.google.com with SMTP id t10so24075eei.14 for ; Wed, 12 Mar 2014 13:42:50 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :cc:subject:references:in-reply-to:content-type :content-transfer-encoding; bh=2tCj8bWX1bNeHrTIaWYtBUfdOt2A2VeNy1nRuEh4tls=; b=EO5IMQRkRTx8hTNGAgfvIBmCuNzwPDpKh54IJeWcR/810gVGnWUhr1e1YUXaRRiUhg REo4a1SnQLqaN+5SHu7acdjnnLNk4yfobuuqnowqqjNbl9HNFmF6C+uh4j/uc3xR7AGd UgsPE1QeQlIIqKNt2SQQtTDa+7s4BoJ6XHaCjA/zBslMw/deQNCGnSn7kvbNiW2/oiPZ sKIzz6iJIw2cSdJ/zPXsuJFQDzVBcA81pp2kb/XKkm7ySp9/0AVUJ6k+Yosm4sEaxm3M rhziYZEJDlJmBcbnqdiL2DH7JeLCOUscJJdYdo1IRJafk4rQSt3x2MjC14jaO85C4aoL 5PJg== X-Gm-Message-State: ALoCoQm34FarQ2ICQntsgX9mmGftZ+Fwp89UKWXxL0vmML4lG7FGfwdbT9IQhiqRHZRGfUWhHHtA X-Received: by 10.14.219.137 with SMTP id m9mr5993460eep.77.1394656970654; Wed, 12 Mar 2014 13:42:50 -0700 (PDT) Received: from tetra.site (nat-0-15.lam.cz. [80.92.242.254]) by mx.google.com with ESMTPSA id q44sm122084eez.1.2014.03.12.13.42.48 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 12 Mar 2014 13:42:49 -0700 (PDT) Message-ID: <5320C6C7.9040602@gk2.sk> Date: Wed, 12 Mar 2014 21:42:47 +0100 From: Pavol Rusnak User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 MIME-Version: 1.0 To: William Yager References: <44fcb02b-3784-45a6-816a-312c78d940cd@me.com> <5320B7F1.8060701@gk2.sk> <5320BDD1.50001@gk2.sk> <5320C27B.8090205@gk2.sk> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. X-Headers-End: 1WNpzM-0001xP-S7 Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] [RFC] Proposal: Base58 encoded HD Wallet root key with optional encryption X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Mar 2014 20:43:00 -0000 On 03/12/2014 09:37 PM, William Yager wrote: > (that group of people includes me), PBKDF2-HMAC-SHA512 is very easy to > implement even on devices that only have a few kB of RAM, and even though > our number of rounds is very aggressive (2^16 and 2^21), it will still run > in reasonable time even on very slow embedded ARM processors. To give you some numbers: TREZOR (120MHz ARM) does 1024 rounds of PBKDF2-HMAC-SHA512 in around 1 second. So 2^16 is around one minute, 2^21 is around half an hour. -- Best Regards / S pozdravom, Pavol Rusnak