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Let P be a point of projective space PG(n,q) (n ≥ 3 ) over field GF(q), π be a S-space through P in PG(n,q) (S ≥ 1). Let S be the source set composed of r- spaces through π (s <; r ≤ n), E be the encode rules set composed of (n- s) -spaces which intersect π at P, M be the message set composed of (r - s) -spaces which intersect π at P. For any π1∈ S, π2 ∈ E, define f(π1, π2) = π1 ∩ π2 , we have...
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