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.
>
> #OrNYAMv67ABbqnK01lSLaHsKlmOBIwcFqzuEXezq5cAYnu6IFvAF8IBXMDCp8R7NheeL13UiFV39S
> "02312ZqeVxtl3gw6NVawApA9bwn9LLGBfE/66UCuABlSFVRSr00stZa7YkchPYzsaMdQcLWp5xKCd
> 0BUpoXvq5vnxVMgz29HvqTrnZVpDfDpWKB3m0uCcBY4rKSFoQ3rWDi8lArMyig2/nPObKuucdhlQjt
> OkQMgNXiH9l+bOmeMpiNTN8PIZoEcFFl0YwtcSXGOo4Tam21XPf7N9izo/7LAemLSG3mZ55cAgLegq
> +XJoRGtDMLrDj  Ho7b9Q  I/IeCa60CPfzR2rTh2Ng9aNLsxYLxBUS+ZnRJHQmmjGo6v4FfBnIVZx
> 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
> SV2t9d9QPLEGEBIexr69FqX3fLii4UUouUUfs8RLJAHgWEoztt1tloZ8I7TsBpGtfTJntGyZdwcKEW
> NW7BTaYhVj70niCV4Ws407gIjZN5gIW1XeplrvpKEOGzuN9vmynojJOdgVfVV2hgJISHMCZHYehge0
> jzGCFECNwaUmxJiP80PRWWwjBY7hKnjhQjvyvhtGcNMEZAQPKYPYJcYQFIrCVjzDQmZUnZXNBu7SIy
> qneV+2/f4rOxDgu56FqYA39CAgtCVQTwmrWkpFt1M1ACFnacRf9ypJgS1kEURs3xx2/dngv0YGiSZG
> tiLXL3PyxR8mv21RsVCD2wA00400eNo1kFtLAzEQhd/zK8YiVKENVRBFEKEIPpWK1Ic+Zjezu6O5LJ
> mEdf+9k8U+5TLnO2dm9sfj4QqUOscClmxYZ7DYFUbIA0ITfQNtTAnb7Gat3sjCLEofLXXzIhlT7JPx
> EBMkDMYjUH6F0wWeyDnA39FFK5VuoW2UGOVNoLE4kysBrUkS69wMN/IyjuOFYpgGDP/gBkyGTB55Ay
> L5LpwhlaAq0xsKUEImVw15iBMvHUqON5liuNXqYH4QuCSsfms5BA4U+kpMlAf4LM0Md/pJPwhnQbqq
> KylcNbX2jp43SjQlMOa8fH/tz8eP07OC68v9ZbUSZ1ENZhzn+93ucYvUY2idYdYx9dslQqdGqboqxj
> 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 <mfp / acm.org>
> #                         http://eigenclass.org
> # Get the hidden message and claim your prize at eigenclass.org!
> __END__
> eNpVUVtr2zAUZo817D+IYBOp2RSnS9ouqh/cxQ2GxYEmbLAsCFk+zbw6tifJpeTy36c4g1G9SDrn8N1O
> 3RjdnURf5pM4mVJKUTxN5o8RmkWLRTiNFug+ejj9wySehct4nnSZgj9NrgB1s3wD2vS32ajruN+ix/v5
> IkIoQGVeOCZ4yAugCkSGXZ8wPPB9v6dEmeGR7xNCTb4FvU9hk5dMfEgDPKD0itCtqPftlKE63wE5Ul0p
> w+BFFNisBKXp+tJinZGuLBCxerRsAEWvEmqTVyWDMjs6jstFsFozDYYbJSTwp6aUqFaV3B8uBT/Y/t0d
> FpxmUIABLgweEiY4OTLXBJNwGbITCXv/FgFbd4TJQmiN5ulvkIY1ZQZPfAvmV5WhcY3+CbKDyEphtol3
> QefTYDi6Ho461nrFc8YmbXrj8WwyoucksZV0auqeFEUB6vx2O3SjoMZ9qlK3T85Fz/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