Simple past tense and past participle of decipher.(verb)
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Use "deciphered" in a sentence
"Ryan has once again deciphered your code words and found you morally lacking."
"In reply to the inquiry as to a _priest's wife_, p. 77 Number 5, I would suggest that married persons may have separated, and retired each into the celibacy of a convent, yet might join, when necessary, in a legal conveyance; but I should examine closely the word deciphered"
"These people, with their quiet-smiling, quiet-frowning faces, connect one instantly with the stories out of the past that may be deciphered from the stained glass windows on the stair-landings which deal with various aspects of early days."