Simple past tense and past participle of cipher.(verb)
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Use "ciphered" in a sentence
"He informed me about his excellent progress in a meticulously ciphered message that came by email last week."
"In the cipher's most developed state, the first word of a ciphered message was a key word, indicating the number of columns and lines into which the subsequent words needed to be arranged as well as the route for reading them correctly."
"The elimination of the troublesome Catholic exile Reginald Pole was an idea cooked up by Wyatt and others in 1539; some ciphered letters remain, and some loose talk about the efficacy of quick-acting "Spanish poison", but it was more of a notional chess move than a genuine plot and nothing came of it."