[RC5] RC5-72: status request

bert bertodell at suddenlink.net
Mon Aug 11 20:09:25 EDT 2008


Décio Luiz Gazzoni Filho wrote:
> On Aug 11, 2008, at 6:14 PM, bert wrote:
>
>   
>> Ed Wensell III wrote:
>>     
>>> --- On Mon, 8/11/08, bert <bertodell at suddenlink.net> wrote:
>>>
>>>
>>>       
>>>> I bet they are wanting
>>>> the OGR people to
>>>> do RC5-72 since it will take more than a 1000  years to
>>>> complete(despite
>>>> what loyalists will say,RC5-72 hasn't hit 1% and
>>>> won't for probably
>>>> another 5 1/2 years and probably another 100 years after
>>>> that before it
>>>> hits 10% lol)
>>>>
>>>> Bert O'Dell
>>>> _______________________________________________
>>>> rc5 mailing list
>>>> rc5 at lists.distributed.net
>>>> http://lists.distributed.net/mailman/listinfo/rc5
>>>>
>>>>         
>>> Unless we can get our hands on 1 million PS3's, at which point  
>>> it'll be done in a year (there have been 14.4 million units sold as  
>>> of June 2008, 5 million of those are in the US).
>>>
>>> --
>>> Ed Wensell III
>>>
>>> 24/7 support is only available for 3.428571 hours per day.
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> rc5 mailing list
>>> rc5 at lists.distributed.net
>>> http://lists.distributed.net/mailman/listinfo/rc5
>>> ------------------------------------------------------------------------
>>>
>>>
>>> Internal Virus Database is out of date.
>>> Checked by AVG.
>>> Version: 8.0.100 / Virus Database: 270.4.4/1531 - Release Date:  
>>> 7/2/2008 7:02 PM
>>>
>>>       
>> Why state something that will never happen and more than likely if
>> true(getting a million PS3's),you still won't be making that much of a
>> dent in it. It's not going to happen.
>>     
>
> Erm... a PS3 can do ~170 Mkeys/s, so 1 million PS3s can do 170 Tkeys/s  
> (170*10^12 keys/s). The full keyspace of RC5-72 is 4.72 zettakeys  
> (4.72*10^21 keys). If you divide the latter by the former, you get  
> 23.6 million seconds; a year has 31 million seconds, give or take. So  
> worst case, even if we had to search the full keyspace, it would take  
> 9 months or so; since we expect to search only half the keyspace, make  
> that 4.5 months.
>
> We could still meet the 1-year deadline with 400k PS3s, however  
> unreasonable that may still seem.
>
> Décio
> _______________________________________________
> rc5 mailing list
> rc5 at lists.distributed.net
> http://lists.distributed.net/mailman/listinfo/rc5
> ------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG. 
> Version: 8.0.100 / Virus Database: 270.4.4/1531 - Release Date: 7/2/2008 7:02 PM
>   
I would love to see that theory tested out,but I don't ever see that 
happening no matter what one might say,and half the keyspace? It's 
possible the winning key is at the beginning,or in the middle,it could 
be found tomorrow,but I see many years of crunching unless one finds 
500k or more crunchers now(like I said not going to happen.)


Bert


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