The Collaborative International Dictionary of English v.0.48:

Cipher \Ci"pher\, v. i. [imp. & p. p. Ciphered; p. pr. & vb.
   n. Ciphering.]
   To use figures in a mathematical process; to do sums in
   arithmetic.
   [1913 Webster]

         'T was certain he could write and cipher too.
                                                  --Goldsmith.
   [1913 Webster]