The only correct spelling is "consensus"; "concensus" with two Cs is a misspelling. "Consensus" refers to a general agreement or widespread acceptance among a group of people regarding a particular issue, decision, or idea.
"Posess" is a misspelling of "possess," which is a verb that means to have or own something, to hold or control it, or to have a certain quality or characteristic.
"Consistant" is a misspelling of "consistent," which is an adjective that describes something that is constant, unchanging, or uniform in its behavior, quality, or appearance.
"Cyphering" is the British spelling of the American word "ciphering," which refers to the act of putting a message into a secret code or performing mathematical calculations.