Main Result. In the following, an inner bound on the pairwise key capacity region of the source model with rate-limited public channel is given. First, we define: r12 = [I(S12; X2 |S23S32) − I(S12; X3, S13 |S23, S32)]+, r21 = [I(S21; X1 |S13S31) − I(S21; X3, S23 |S13, S31 )]+, r13 = [I(S13; X3 |S23S32) − I(S13; X2, S12 |S23, S32)]+, r31 = [I(S31; X1 |S12S21) − I(S31; X2, S32 |S12, S21 )]+, r23 = [I(S23; X3 |S13S31) − I(S23; X1, S21 |S13, S31)]+, r32 = [I(S32; X2 |S12S21) − I(S32; X1, S31 |S12, S21 )]+, I12 = I(S12; S21 |X3, S13, S23) , I13 = I(S13; S31 |X2, S12, S32) , I23 = I(S23; S32 |X1, S21, S31) , I1 = I(S21; S31 |X1) , I2 = I(S12; S32 |X2) , I3 = I(S13; S23 |X3) . Theorem 1: In the described setup, all rates in the closure of the convex hull of the set of all key rate triples (R12, R13, R23) I( S21,S31;X2,X3|X1) +I(S12,S32;X1,X3|X2) +I(S13,S23;X1,X2|X3)
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