Holocryptic \Hol`o*cryp"tic\, a. [Holo- + Gr. kry`ptein to
conceal.]
Wholly or completely concealing; incapable of being
deciphered.
[1913 Webster]
{Holocryptic cipher}, a cipher so constructed as to afford no
clew to its meaning to one ignorant of the key.
[1913 Webster]