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In this paper an Adaptive Neural Network guided Random Block Length based Cryptosystem (ANNRBLC) has been proposed for online transmission of data/information through wireless communication. Both communicating networks receive an identical input vector, generate an output bit, networks are trained based on the bit, and as a result of this dynamics through adaptive weight vectors the networks synchronize to an identical time dependent weight vectors. This phenomenon is used to form a secured secret-key through a public channel. Three sub keys are generated during the process to encrypt string of random length (multiple of 64 blocks). Length of sub key 1, sub key 2, sub key 3 is 128 bit, 192 bit, and 256 bit respectively. Identical weight vectors are used to generate first sub key of 128 bit length. Subsequent sub keys are generated as intermediate steps of the technique using neural cryptosystem. A …