Fidelis Security “Decode This” Black Hat Challenge
 

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Fidelis Security “Decode This” Black Hat Challenge

Ciphertext:

^
¥Ð§µ    
¶®Æä
æ©×ä
÷ijŒĐ
ƆķėIJ
ŦůŶū
ƂƐƔƆ
ŦƉƶǴ
ƆƅƦƬ
džƹɇʃ

Hints (provided every few hours via Twitter):

  1. line breaks for clarity, not part of puzzle. neither is ^.
  2. the word “Fidelis” is part of the message
  3. get to know xxd
  4. “yen” and “mu” are the same [used actual chars]
  5. There are 20 characters in the message.
  6. ‘C2A5’ =~ /.{3}(.)/
  7. Take a nybble out of each sybble. All you need is $1
  8. 50 75 6E 64
  9. [a perl script to decode the ciphertext]