1) Alter 2) Change 3) Make intelligible 4) Modify 1) Decode 2) Unknot 3) Unpick 4) Unravel 
[v] - make intelligible
to bring out of a scrambled condition; reduce to order or intelligibility. · to make (a scrambled radio or telephonic message) comprehensible by systematically tuning the receiver to the frequencies used in transmission. Cf.(def. 2).