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Just joined Team Anandtech cracking at RC5. A couple ignorant questions...

J

Jothaxe

Golden Member
I hope I dont rub people the wrong way by asking these questions, but I read through the faq's posted here: faq1 and here: faq2 and I am still curious.

First, what is the link between RC5 and cows/bovine?

Second, what is the total number of possible key combinations... is it just 2^64 or ~ 10^19 ?

Third, what is a decent number of keys to be cracking per second for a single PC?

My PIII 600Mhz does about 1.5Mkeys/sec. Is this poor, or decent, or good, or what? (based on the CPU)

Maybe you guys could give me some samples, for PC's you run the client on. What is the best rate you have seen for a single processor PC, be it AMD or Intel based?

Thanks for any information!

-jothaxe
 


<< First, what is the link between RC5 and cows/bovine? >>



Not sure what the genesis of that is, but maybe it comes from the nick of one of the guys running the project.



<< Second, what is the total number of possible key combinations... is it just 2^64 or ~ 10^19 ? >>



Too much for my tired old brain.



<< Third, what is a decent number of keys to be cracking per second for a single PC? >>



Varies by CPU type and speed.



<< My PIII 600Mhz does about 1.5Mkeys/sec. Is this poor, or decent, or good, or what? (based on the CPU) >>



About right assuming your actually using your system.



<< Maybe you guys could give me some samples, for PC's you run the client on. What is the best rate you have seen for a single processor PC, be it AMD or Intel based? >>



Clock for clock, the Athlon/Duron cores destroy anything Intel has. For example, a P3-1Ghz is capable of about 2.8M Keys/s while a 1Ghz TBird comes in at 3.5M Keys/s.

Russ, NCNE
 
Thanks Russ...

Also, what is the difference between a &quot;work unit&quot; and a &quot;packet&quot; ? How many keys are in each?
 
So then there are 2^(64-28) = 69 billion possible WU's to crack.

Wow! Now I am starting to get an idea of the size of this thing.
 
Huh, 2^64 is rather 18 billion billion keys.

About the cow thing, Jeff 'Bovine' Lawson initiated dnet, hence the cow logo. You can read dnet history here.

edit - Russ beat me
 
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