20. The system of claim 18, further comprising ambiguity sensing means, whereupon whenever said inconsistency determining means determines that there are no inconsistencies, said ambiguity sensing means determines whether all of said glyphs have been identified and, if not, selects the next decryption routine to be performed.
18. The system of claim 14, wherein said decryption means includes inconsistency determining means which determines whether the results produced by each of said decryption routines is consistent with the glyph/symbol correspondences previously determined during other decryption routines.