Hŏl/o-crȳp'tic, a.

a. [Gr. ὅλος, whole, complete, and κρύπτειν, to conceal.] Wholly or completely concealing; incapable of being understood or found out.

Holocryptic cipher, a cipher so constructed as to afford no clew to its meaning to one ignorant of the key or scheme in accordance with which it is arranged.