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The cryptographic system consists of transforming a message via an enciphering function (or encryption) in such a way that only an authorized recipient can invert the transformation and restore the message. In cryptography mathematics has been used to ensure that a certain minimum effort (beyond the power of the adversary) would have to be put in for reading the secret writing. From the angle of the cryptanalyst, mathematics has been used to develop general methods of reading the secret writings of a particular class. It has been recognized that encryption and decryption mostly emerges from mathematical disciplines.
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