cypher
cryptograph, cypher, secret code
cypher, nobody, nonentity
aught, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, ZIP, zippo
0, cypher, nought, zero
calculate, compute, cypher, figure, reckon, work out
code, cypher, encipher, encrypt, inscribe, write in code
