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Re: [Taler] Exporting coins out of the wallet plugin

From: Sree Harsha Totakura
Subject: Re: [Taler] Exporting coins out of the wallet plugin
Date: Fri, 21 Jul 2017 15:04:26 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

On 07/21/2017 03:00 PM, Sree Harsha Totakura wrote:
>> With this feature in place, there is no way to be 100% sure
>> about wallet's 'abdication' on exported coins.  In other words,
>> since "owning a coin" means owning a private key, we cannot be sure
>> that the wallet actually removes that private key from disk, after
>> coin exportation.
>> So the coins sharing must always occur between trusted parties.  Unless,
>> and some "crypto person" may help here, the wallet can export some
>> "refresh permission" on the exported coins so that the person that gets
>> it can obatin new private keys for the coin she received from wallet 
>> exportation.
> The coin export only works between trusted parties.  In fact, the
> refresh protocol ensures that if you know the private key of a coin, you
> will also know the private key of the refreshed coin.

Oh, I missed this one in the last message: what I meant with abdication
is that the wallet that exported the coin will no longer have the coin
history.  Hence, it will not know how much of the coin is left unspent,
and therefore it cannot refresh or spend the coin unless the user tells
it explicitly how much of the left is spendable.  But user telling the
wallet is prone to human error.


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