The Collaborative International Dictionary of English v.0.48:

Obfuscate \Ob*fus"cate\, a. [L. obfuscatus, p. p. of obfuscare
   to darken; ob (see Ob-) + fuscare, fuscatum, to darken,
   from fuscus dark.]
   Obfuscated; darkened; obscured. [Obs.] [Written also
   offuscate.] --Sir. T. Elyot.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Offuscate \Of*fus"cate\, Offuscation \Of`fus*ca`tion\
   See Obfuscate, Obfuscation. [Obs.]
   [1913 Webster]