Mainly interested in:
Set theory and topology, with emphasis on selection principles.
Mathematical cryptology and computational group theory.
Glad to give away his reputation points as bounties for helpful answers.
32 Bidi: A new cardinal characteristic of the continuum? May 12 '15
9 Covering the space by disjoint unit circles Apr 3 '14
9 nontrivial theorems with trivial proofs May 9 '14