two of three

From: Bob Harris (plasticnitlion_at_wrappermindspring.com)
Date: 01/28/05 

Date: Fri, 28 Jan 2005 13:36:31 GMT

Howdy,

Suppose I have a value x (chosen from some range) and I want to encrypt it
with three value a, b, and c (each from the same range as x) such that x can
be recovered from any two of those values. In other words, we have
functions f, g, and h such that f(a,b) = g(b,c) = h(c,a) = x.

Do such schemes exist? (I think probably the answer is yes). Please
enlighten me.

Thanks,
Bob H