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The Collaborative International Dictionary
Uncipher

Uncipher \Un*ci"pher\, v. t. [1st pref. un- + cipher.] To decipher; as, to uncipher a letter. [Obs.]
--Sir W. Temple.

Wiktionary
uncipher

vb. (context obsolete English) To decode or decipher.

Usage examples of "uncipher".

The fact that the enemy could use unciphered messages was nothing in his autocratic eyes.

Finally, my original, unciphered letter burned, I was to post my invitations and plan my party.