The Collaborative International Dictionary
Decipherable \De*ci"pher*a*ble\, a. Capable of being deciphered; as, old writings not decipherable.
Wiktionary
a. That can be deciphered, understood or comprehended.
WordNet
Usage examples of "decipherable".
Derridean polyvalence, it reaches quite determinable persons in a determinable place, where it yields an all too decipherable meaning.
To the aliens what he said must have been a ghastly hodgepodge of gibberish but he was able to transmit his command to the general-something about a Day in May, the Alma Mater and a Donnybrook, red-eye cement mixers, a 'beef trust' and the sheenies-all of which was decipherable as: no Terran engagement in the battle between Arkon robots, Mounders and Springers except in case of catastrophe.
This means that cryptograms must be decipherable without ambiguity, without delay, and without error.