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In this paper, we propose secure communication schemes using projective-lag and/or projective-anticipating synchronization or multidelay feedback systems and the modulation scheme of synchronization-manifold shift keying. The strategy to assure the security is based on non-stationary dynamics and random synchronization manifolds. Where, random synchronization manifolds are generated to encode various blocks of bits during transmission time. Numerical simulation will confirm the performance of the proposed security schemes.