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Exchanging information electronically in a secure way become very important in the age of computers. Over fifty years of research and implementation were devoted to developing methods and systems for such a secure communicat ion. These systems are common ly known as cryptosystems. Among the cryptosystems currently in use, the public key cryptosystems have a special place. These are cryptosystems which allow any user, completely unaware of the methods of encryption and decryption, i.e. of thedoi:10.5923/j.algorithms.20120105.01 fatcat:67b3nojgznhdvktslc7cx6dpr4