Simple past tense and past participle of encipher.(verb)
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Use "enciphered" in a sentence
"This elegy, like the others, is a "lyric cry" of a man, an age, and a race; "enciphered" like them, with all the cunning of which the artist was capable; and decipherable only to those who know the language of the English lyric."
"Yes, since you asked, we all got our daily enciphered marching orders from Koch Central (couriered, as usual, in a black envelope by a man who, according to official records, does not exist) a few months back."
"The nulls may frequently occur in the enciphered message but they are, of course, immediately disregarded by the receiver."