1. Find out who encoded the data in this format in the first place.
  2. Tie said person to a workbench.
  3. Beat said person's feet with a rubber hose until an agreement is reached wherein said person will retype all of the data in a sensible format.

This method is sometimes known as "rubber hose cryptanalysis".

$;=sub{$/};@;=map{my($a,$b)=($_,$;);$;=sub{$a.$b->()}}
split//,".rekcah lreP rehtona tsuJ";$\=$ ;->();print$/

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In reply to Easy three-step method for decoding EBCDIC COMP-3 data by jonadab
in thread EBCDIC & COMP-3 *shriek* by Grygonos

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