1) Classical cipher 
Sheshach - (Jer. 25:26), supposed to be equivalent to Babel (Babylon), according to a secret mode of writing among the Jews of unknown antiquity, which consisted in substituting the last letter of the Hebrew alphabet for the first, the last but one for the second, and so on. Thus the letters sh, sh, ch become b, b, l, i.e., Babel (see: Atbash ciph...