Step 4

wow, you passed it. i did not anticipate this. good luck on this next cipher.
what gives the encoding mechanism away?

3d 6b 57 5a 35 42 58 64 4b 67 47 5a 30 4e 33 63 4b 63 47 5a 30 6c 57 61 4b 59 57 61 6c 78 47 61 4b 34 47 61 79 4a 48 64

hint: if you're stuck, think of putting the characters in an order.