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Door , , 5 reacties
Bron: Distributed.net

Kees schrijft: "Nu eens niet de RC5 maar de CSC-statsbox die leuk doet: het ziet er naar uit dat er voor de CSC challenge helemaal geen oplossing is, althans niet in de 104% die ze gecheckt hebben ":


Total Blocks to Search: 268,435,456
Total Blocks Tested: 280,091,779
Keyspace Checked: 104.342%
Total Keys Tested: 75,186,564,417,716,224
Time Working: 52 days
Overall Rate: 16,734,901 KKeys/sec [break] Natuurlijk is dit ook niet onopgemerkt gebleven bij de Distributed.net staff. Hier de .plan update van Daniel Baker: [/break] I've gotten a very large number of emails asking for clarification on the distributed.net reissuing policy and for details about the precise amount of blocks being reissued. I have been distributing this form letter:

-----------------------------------------------------
Greetings!

Thanks for your email regarding my post[1] or about CSC being shown as more than 100% complete on the statistics page[2].

It is perhaps a common misconception that each CSC work unit completed is unique. With a short contest like CSC, we have implemented special keymaster code to use complex tests to verify the authenticity and validity of each work unit submitted. Malicious users could conceivably run a tampered version of the distributed.net client to gain an unfair advantage in statistics and rankings. In order to test an experimental method of attempting to uncover and disqualify these users, it was decided that certain CSC work units would periodically reassigned work done by suspect users to random clients to ensure that our work is not compromised. As an unfortunate result, work is duplicated.

There is no question that this method of project security is suboptimal. We are aware of the flaws of this method and are working to develop a new generation of clients that can produce secure and reliable results. Jeff Lawson, distributed.net project leader, has written an explanation[3] of all of the considered methods. Distributed.net users can expect to see one or more of these methods utilized in future clients and contests.

The method used by the keymaster to decide which blocks should be flagged for reissuing is fairly complex and varies depending on a variety of factors. At this point in the contest, we generally have been reissuing between 9.1% to 11.5% of received blocks.

It is distributed.net policy to give users credit for all legitimate work completed, regardless of whether it's virgin work or reassigned work. Accordingly, the completed percentage showed on the statistics server represents both virgin and reissued work units, so it's possible that we go beyond 105% completion.

Every key in the keyspace has an equal chance of being "the" key. Statistically speaking, it was unlikely that we reached this far in the keyspace without finding the success key. However, this is no indication that we will not find the key. We are just as likely to find the key as we ever were.

I apologize if I didn't address your issue specifically. I receive hundreds of messages a day, and that load is growing exponentially as we get further and further beyond 100% in CSC. If you need general distributed.net support, please contact help@distributed.net. Otherwise, can you resubmit your message to me.

Thanks for your continued support. Good luck.

Daniel Baker
distributed.net project leader

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Reacties (5)

Yeah very nice story indeed :I
eheh right now i get my chance to crack Superweb of for the rest of the world :))
Superweb blows...
Ik begin het toch steeds minder te vertrouwen...
Kan natuurlijk ook een foutje in de client zitten :( dat zou wel om te :'( zijn...
als er aar geen foutje in rc5 zit :)

daar duurt het wel wat langer...

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