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The Unshared Secret Key Cryptography (USK), recently proposed by the authors,guarantees Shannon's ideal secrecy and perfect secrecy for MIMO wiretapchannels, without requiring secret key exchange. However, the requirement ofinfinite constellation inputs limits its applicability to practical systems. Inthis paper, we propose a practical USK scheme using finite constellationinputs. The new scheme is based on a cooperative jamming technique, and isvalid for the case where the eavesdropper has more antennas than thetransmitter. We show that Shannon's ideal secrecy can be achieved with anarbitrarily small outage probability.

Unshared Secret Key Cryptography: Finite Constellation Inputs and Ideal Secrecy Outage