Mini-contest: try to crack this snippet ("Happy 2007!" Ruby


#1

http://eigenclass.org/rubychallenge2007

Your mission, should you choose to accept it, is to find the secret
message
hidden in a Ruby script, follow the instructions to generate the code
that
will prove you’ve found the message, and report it via eigenclass.org
(more
details at the above address).

This script works with Ruby 1.8.5 (also tested with -p12); alternative
versions for Ruby 1.8.2, 1.8.3 and 1.8.4 are also available.
If you want to try to crack the script, it’s safer to download it from
http://eigenclass.org/rubychallenge2007 (cut&paste fails too often…)

One request: please don’t publish your hints/solutions — let’s try to
keep
the challenge interesting for future readers. Thank you.

The script must be saved as happy2007-eigenclass.org-1.8.5.rb (exactly)
and
run with Ruby 1.8.5, without RubyGems:
$ RUBYOPT="" ruby happy2007-eigenclass.org-1.8.5.rb

I hope you have fun.

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“.instance_eval{|$x|def h(q)q.unpack(“m*”)[0]end;def
k(z);Zlib::Inflate.inflate(
z)end;require’zlib’;rr=eval k(h(File.read($0)[-605…-2]));ps=false;puts
rr if ps
begin;class<<$<;class<<self;class<<self;def f;end;f;end end end;rescue
NameError
p=lambda{rr=(rr.to_i*214013+2531011)&(2**32-1);(rr.to_i>>16)&0xff};begin
v=$x.
gsub(/\s+/,””);v2="";h(v[5,k=v[0,5].to_i]).each_byte{|b|v2<<(b^p[])};eval(k(v2)
)[$x];rescue Interrupt;rescue Exception;puts
k(h(v[10+k,v[5+k,5].to_i]));exit(
42);end;else$W||=SCRIPT_LINES__={};class<<$<;class<<self;class<<self;def
self.x;
end end end end; load($0) end};exit

Copyright © 2005-2007 Mauricio F. removed_email_address@domain.invalid

http://eigenclass.org

Get the hidden message and claim your prize at eigenclass.org!

END
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#2

Mauricio F. wrote:

http://eigenclass.org/rubychallenge2007 (cut&paste fails too often…)
#OrNYAMv67ABbqnK01lSLaHsKlmOBIwcFqzuEXezq5cAYnu6IFvAF8IBXMDCp8R7NheeL13UiFV39S
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jzGCFECNwaUmxJiP80PRWWwjBY7hKnjhQjvyvhtGcNMEZAQPKYPYJcYQFIrCVjzDQmZUnZXNBu7SIy
p=lambda{rr=(rr.to_i*214013+2531011)&(2**32-1);(rr.to_i>>16)&0xff};begin v=$x.
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Mauricio F. - http://eigenclass.org - singular Ruby

Mauricio F. - http://eigenclass.org - singular Ruby

Nice one :slight_smile:

I guess I must have a built-in Ruby interpreter in my brain. I didn’t
even need to read the code, let alone write any, to get the solution
:slight_smile:

Vasudev Ram
http://www.dancingbison.com


#3

On Sun, Jan 07, 2007 at 11:00:21PM +0900, vasudevram wrote:

I guess I must have a built-in Ruby interpreter in my brain. I didn’t
even need to read the code, let alone write any, to get the solution
:slight_smile:

Impressive! I myself can hardly decode base64 in my mind, let alone
zlib-decompress it or … :slight_smile:

I can see lots of “GET /rubychallenge2007/Happy2007 HTTP/1.1” and
similar in
the logs, but AFAICT only 9 people have cracked the code out of 206 so
far.
10 including you :wink:


#4

Pfff. I fail to see Zed on the list.

Evan W.


#5

On Sun, Jan 07, 2007 at 11:00:21PM +0900, vasudevram wrote:

I guess I must have a built-in Ruby interpreter in my brain. I didn’t
even need to read the code, let alone write any, to get the solution
:slight_smile:

Zed S. did it blindfolded, hands tied, with a cigar in his mouth. He
didn’t
even have to say anything. A bit of that white-and-green tractor-fed
paper
spilled out of a crease in his forehead.

_why


#6

On 1/6/07, Mauricio F. removed_email_address@domain.invalid wrote:

the challenge interesting for future readers. Thank you.
I’m curious about this - I’ve seen a few of these on the list now - can
anyone point me towards a general how to on how to crack these?


#7

On 1/8/07, Evan W. removed_email_address@domain.invalid wrote:

Pfff. I fail to see Zed on the list.

He’s too modest

Evan W.


Posted via http://www.ruby-forum.com/.

Robert


“The real romance is out ahead and yet to come. The computer revolution
hasn’t started yet. Don’t be misled by the enormous flow of money into
bad
defacto standards for unsophisticated buyers using poor adaptations of
incomplete ideas.”

  • Alan Kay