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mini-contest: try to crack this snippet ("Happy 2007!" Ruby challenge)

 
 
Mauricio Fernandez
Guest
Posts: n/a
 
      01-06-2007
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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ThuG4tBCTsMrV4enitht+ ITOE4 2Fr5 sa v9ag 7lIZw EYHMdZFbRlO8blKy1q1tOQtxZ
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ZhBhmLTS/7kJkNLead7LWOToHJotZa/QG9gJR7nNQde2XvHS8rqELruQqnMCQYPOvJepTOCl79AioL
".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 (C) 2005-2007 Mauricio Fernandez <(E-Mail Removed)>
# http://eigenclass.org
# Get the hidden message and claim your prize at eigenclass.org!
__END__
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--
Mauricio Fernandez - http://eigenclass.org - singular Ruby

 
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vasudevram
Guest
Posts: n/a
 
      01-07-2007

Mauricio Fernandez wrote:
> 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.
>
> #OrNYAMv67ABbqnK01lSLaHsKlmOBIwcFqzuEXezq5cAYnu6IF vAF8IBXMDCp8R7NheeL13UiFV39S
> "02312ZqeVxtl3gw6NVawApA9bwn9LLGBfE/66UCuABlSFVRSr00stZa7YkchPYzsaMdQcLWp5xKCd
> 0BUpoXvq5vnxVMgz29HvqTrnZVpDfDpWKB3m0uCcBY4rKSFoQ3 rWDi8lArMyig2/nPObKuucdhlQjt
> OkQMgNXiH9l+bOmeMpiNTN8PIZoEcFFl0YwtcSXGOo4Tam21XP f7N9izo/7LAemLSG3mZ55cAgLegq
> +XJoRGtDMLrDj Ho7b9Q I/IeCa60CPfzR2rTh2Ng9aNLsxYLxBUS+ZnRJHQmmjGo6v4FfBnI VZx
> h0XTyv0X4+jcA wmWsmS 4cpRZ1ev7zmwvbWMFG5KZlDPoBLlgWoqe2FoDKx3q3n/UDmi6beIMdO
> nz4VAxdGERKv3 cki9FT O8aHKbLlx/BlP4hcD+63B+eRpAgK58DnV4sUKvo9BCuwQqM8k6WcDqS
> WP7ZNGiW8eA4y UIfsyd kX1v mUI Z FCsr A EUS ao47J GMlefa8WAd0b0UN
> YsfAiDTOmWugK 9MDpTe gqE cz/7 cy l1 86M kf P6n TLf bxh5zibUMKyMmmGx
> 8OK5/1KjPRq1X aFUZkijk Qo Lx/Y 8R 7P38 WV ZL0 6Spf3M+okFpRQg2G
> UpfuWbtyB06BH 2Eu/vZ tbS AW 8kGx It 8VEl JP UZ2 8zosYQvGPPiDJmwU
> BpD+lkFRe/Piu 3kydXF Ij oHL5 ud mbSy Ti 6bwe daK a HYPybXbENNQlJoSGr
> CMCxXR3KlonNk NOCefm +4 fq6H 9o Yi0S vk +a1W AWx S AT5p/7w4YkUrFIxo/
> TESZLgRi1KIkw Nz4c8t NV yVB E5 eU E/h Av hev6v vd5lgvX4xykKm2PzV
> EvGksbbXFjezU Ennwvv FtT K 2y J c8h+ / 8NaJwN VbFruIzmZ6A9GomBIV
> 1nN0eUMI5vdwTBD/034y6pP3gO9+tgY/Z+u D5oBVQlu jNK/74Mua6i RAmHBnc7jSxvMB9os7
> OE0v5q0/qNXYL7jfOZJ0Pgbnvih4ViB6ZWW LGu13Bdl fV3pNN49KZ Ra1rjx0Vtd6bbnVVFyO
> uzaad8w90GXhl52Q4hIkcKYeiT6TJ1O05ir eODiQFTS JRdOZ70m PhyljHwB/FPzjJvSseqW
> tJab3eZ+6uRFmEwsYCc37P2/24slUQ1f7d9eDpZ4NS4rVlaeIx5qH1fvZis8SUTGi3qT4BuK/wwGJb
> Dfw3dLu2uzIF4LbRzEl59Ni7EC0q/Pj0FUlY25CESpCiX7Tn8VhzJP7ObzONwpB1IptdshseudGY2F
> jeivpdahI26bvOWlPzb h1f+9T IK6oAn TerM 3DRb4S3gk+PjoejtttW6Ee
> PcnmtNVDNCAcOB9NV5 FWRh 38FS tp 7KCq 1k 6M4yO6ILq xVRpWPwqzICh9sav/u2Pnp
> MHxn4RF3UPxPtMnRc6XxvZHX it ld1g c/u l8v5 1j7p6vM4 ltqOtjAetny2g14uvLGKYC
> fAKn38RogjLz50xMtrw4aPl3 Gt 1J6e tr of90 0j35GGQ vv+TvjX4SeKRn1HPfGS8mjV
> utf/Mh4BFfMdnT8xsCqPMdy IW vb0L pm KgON w0clVkY PlyjUZVqIN2spadEG40Zib7
> geEI0WDd12Wfv45sont9TAE L5m BpSO 6w NfW5 Js9hP8 +UTtyV7vM75mIpxomFHjHWFT
> yNDKGiMk3lJmW3RbGBmTyk c8bJ /kEZ /J cvad O3JCFi TvOhTHvMkcEkG7Rto/vzg1TD
> ThuG4tBCTsMrV4enitht+ ITOE4 2Fr5 sa v9ag 7lIZw EYHMdZFbRlO8blKy1q1tOQtxZ
> 2hQwARL2xBVaMQayxKry FzHVyZ xCS5 go DAcn jKXp/ tkWXIhFV3uDGDgXBfPGJZ69qS
> hfGaODSze+D/ixRRfeL yRMMFlkE mt t0Ig Mm fWqbV gXMbbZ7UN3GelWTpEbAsKa12W
> bqDUMPbQLy16Da85we jnb/ qayEBP Jt5kDC foIihFX3rGmjv8H35nLt4bwKg7
> SV2t9d9QPLEGEBIexr69FqX3fLii4UUouUUfs8RLJAHgWEoztt 1tloZ8I7TsBpGtfTJntGyZdwcKEW
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> qneV+2/f4rOxDgu56FqYA39CAgtCVQTwmrWkpFt1M1ACFnacRf9ypJgS1 kEURs3xx2/dngv0YGiSZG
> tiLXL3PyxR8mv21RsVCD2wA00400eNo1kFtLAzEQhd/zK8YiVKENVRBFEKEIPpWK1Ic+Zjezu6O5LJ
> mEdf+9k8U+5TLnO2dm9sfj4QqUOscClmxYZ7DYFUbIA0ITfQNt TAnb7Gat3sjCLEofLXXzIhlT7JPx
> EBMkDMYjUH6F0wWeyDnA39FFK5VuoW2UGOVNoLE4kysBrUkS69 wMN/IyjuOFYpgGDP/gBkyGTB55Ay
> L5LpwhlaAq0xsKUEImVw15iBMvHUqON5liuNXqYH4QuCSsfms5 BA4U+kpMlAf4LM0Md/pJPwhnQbqq
> KylcNbX2jp43SjQlMOa8fH/tz8eP07OC68v9ZbUSZ1ENZhzn+93ucYvUY2idYdYx9dslQqdGq boqxj
> ZhBhmLTS/7kJkNLead7LWOToHJotZa/QG9gJR7nNQde2XvHS8rqELruQqnMCQYPOvJepTOCl79AioL
> ".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 (C) 2005-2007 Mauricio Fernandez <(E-Mail Removed)>
> # http://eigenclass.org
> # Get the hidden message and claim your prize at eigenclass.org!
> __END__
> eNpVUVtr2zAUZo817D+IYBOp2RSnS9ouqh/cxQ2GxYEmbLAsCFk+zbw6tifJpeTy36c4g1G9SDrn8N1O
> 3RjdnURf5pM4mVJKUTxN5o8RmkWLRTiNFug+ejj9wySehct4nn SZgj9NrgB1s3wD2vS32ajruN+ix/v5
> IkIoQGVeOCZ4yAugCkSGXZ8wPPB9v6dEmeGR7xNCTb4FvU9hk5 dMfEgDPKD0itCtqPftlKE63wE5Ul0p
> w+BFFNisBKXp+tJinZGuLBCxerRsAEWvEmqTVyWDMjs6jstFsF ozDYYbJSTwp6aUqFaV3B8uBT/Y/t0d
> FpxmUIABLgweEiY4OTLXBJNwGbITCXv/FgFbd4TJQmiN5ulvkIY1ZQZPfAvmV5WhcY3+CbKDyEphtol3
> QefTYDi6Ho461nrFc8YmbXrj8WwyoucksZV0auqeFEUB6vx2O3 SjoMZ9qlK3T85Fz/vpac87XZnncf41
> TiLOe9g1tK50gL3/58zXe7MOqqUosacuVuHHH2tMyfLdBWkDt97bKQv1/XDYHwm1yTegV/66Zbaba8pa
> yGfcSTrEVpGHrm8G/u3tzefWLdo5fwFjGbgl1
>
>
> --
> Mauricio Fernandez - http://eigenclass.org - singular Ruby


> Mauricio Fernandez - http://eigenclass.org - singular Ruby



Nice one

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


Vasudev Ram
http://www.dancingbison.com

 
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Mauricio Fernandez
Guest
Posts: n/a
 
      01-08-2007
On Sun, Jan 07, 2007 at 11:00:21PM +0900, vasudevram wrote:
> Mauricio Fernandez wrote:
> > 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).

>
> Nice one
>
> 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
>


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

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

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

 
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_why
Guest
Posts: n/a
 
      01-08-2007
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
>


Zed Shaw 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

 
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Evan Weaver
Guest
Posts: n/a
 
      01-08-2007

Pfff. I fail to see Zed on the list.

Evan Weaver

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

 
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