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Codebreak - english

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Postdi hexen » 14/08/04 16:16

wondered because I know people who would really do something like that :D

hints for level 6? Mind how many bits long the hash you have is, then find out the existing hash functions and how long their output is... no more hints :D
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Postdi BianConiglio » 14/08/04 16:55

the italian version is exatly the same :)
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Postdi pookie » 14/08/04 19:38

I know it's the same in the Italian version.

What I meant is that I saw a lot of messages in italian that talked about "livello 6" and I was wondering if there were any hints somewhere in those discussions.

As for figuring out which hash to use from the number of bytes in the key, I had already thought of that. I was hoping it wasn't a longer hash truncated to 40 bytes.

I was wondering, though, the Intro mentions that words are taken from a dictionnary, but I have seen words like "hgt" and "bps" in my plaintexts. Those words are not in any dictionnary I've ever seen...
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Postdi hexen » 14/08/04 20:34

40 hex digits, not 40 bytes, with a simple logarithmic equation you can find the bit lenght of the hash ;)
A truncated hash would be pretty useless :)
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Postdi pookie » 14/08/04 22:15

Yes, of course. censorshipbits.

Truncating a hash would be a sneaky way of misdirecting a search. You have your 40 hex digits, so you assume a censorship bit hash. You then search using censorship, while the actual hash used was, let's say, censorship but truncating the hex result to 40 characters.

Probably a bit *too* sneaky for tihs game though.

Another fun thing to do for passwords is to change the initialization vertors of the hash functions. So you're using the MD5 algorithm (for example) but your results don't match the standard...
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Postdi zaratrue » 15/08/04 10:29

pookie ha scritto:What I meant is that I saw a lot of messages in italian that talked about "livello 6" and I was wondering if there were any hints somewhere in those discussions.

many messages in the italian topic about "level 6" are deceptive. In order to pass this level, you need of only knowing that your brain is useless, your cpu is a lot important and... the link to "winhash" isn't there without reason

bye
Che cos'è il genio?
è fantasia, intuizione, decisione
e velocità d'esecuzione (cit.)
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Postdi pookie » 16/08/04 05:14

For those who manager to complete level 6, what was the average time? Hours? Days? Weeks???
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Postdi hexen » 16/08/04 09:43

pardon... it's an exponential equation, logarithms have nothing to do with it, for its resolution either.
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Postdi pookie » 16/08/04 16:25

Huh?
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Postdi hexen » 16/08/04 16:34

i meant if you have the hash lenght and want to find out the bit lenght you have to solve an exponential equation :)
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Postdi pookie » 16/08/04 18:42

Getting the bit length from the hash length is simple multiplication, no?

1 hex digit = 4 bits, so... I'll stop here so I don't get censored again.
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Postdi hexen » 16/08/04 20:39

nope
assume you have a n bit long hash. Bit lenght means all digits are 1 or 0 so all the possibilities are 2^n.
In hashes you have hex digits, so all the possibilities are 16^m where m is the string lenght.

So the lenght conversion formula is 2^n=16^m
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Postdi Hyper4S » 16/08/04 22:50

1 hex digit = 4 bits


This is right.

1 hex digit => 16 possibilities
4 bits => 2^4 possibilities == 16 possibilities

So possibilities for 1 hex digit and 4 bits are the same, 1 hex digit is equivalent with 4 bits.

So the lenght conversion formula is 2^n=16^m


This is also correct. Moreover, we can work this out:
2^n = 16^m <=> 2^n = (2^4)^m <=> 2^n = (2^m)^4 <=> (2^n)^1/4 = 2^m <=> 2^n/4 = 2^m <=> n/4 = m

with n: number of bits and m: number of hex digits

So, we get again: 1 hex digit is 4 bits.

In other words, you are both stating the same :-)

At least, if my math is correct...

Grtz,

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Postdi hexen » 16/08/04 23:26

yeah, it works as well but I used teh exponentials in order to keep the concept about possible values of the hash.
Of course a number in a certain base matches a constant number of digits when converted to a smaller base ;)
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Postdi Hyper4S » 19/08/04 13:09

Hmz, are there any hints in the italian Codebreak thread that are helpfull in solving level 7?

I'm desperately looking for some inspiration ;-)

Grtz,

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Postdi BianConiglio » 19/08/04 13:30

no hints :)
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Postdi Hyper4S » 19/08/04 15:38

Damn, arent italians famous for their great kindness? :-P

But don't bother, I made some good progress, I'm close accomplishing level 7 (I think) :-)

Grtz,

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Postdi BianConiglio » 19/08/04 17:13

i'm kind only with nice girls :D

keep working on the 7th ;)
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Postdi Hyper4S » 19/08/04 17:30

Hmz... How do you know that I'm not a nice girl? :P

My real name could be Christina, and I could be a nice girl, but could be posting under a male name, because most computersavvies dont take women seriously :P

But ok, you are right, I'm a man :(
And I'm proud of it! :P

Grtz,

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Postdi dado » 19/08/04 19:11

Hyper4S ha scritto:Damn, arent italians famous for their great kindness? :-P


It's fault of the premium for the first ten code-breakers that ends the game! :diavolo:

House: "Vede, tutti pensano che sia un paziente a causa del bastone"
Wilson: "Allora perchè non indossa un camice bianco come tutti noi?"
House: "Perchè altrimenti pensano che sia un medico".
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