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substitution1

Author

WILL HONG

Description

A second message has come in the mail, and it seems almost identical to the first one. Maybe the same thing will work again. Download the message here.

Hints

  1. Try a frequency attack
  2. Do the punctuation and the individual words help you make any substitutions?

Approach

I searched up a substitution cipher solver and found this website Clicking Auto Solve, the first option seemed to be correct so I tried the flag and it worked. image

Note: Trying it again, the Q in "FR3QU3NCY" was always a q but you can guess what the word is supposed to be.

Flag

picoCTF{FR3QU3NCY_4774CK5_4R3_C001_B810DD84}