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The modern study of symmetric-key ciphers relates mainly to the study of block ciphers and stream ciphers and to their applications. A block ciphers take as input a block of plaintext and a key, and output a block of cipher text of the same size. The crypto systems which are in use are static i.e. only one of the standard algorithms is used at a time. If same encryption methods are used throughout the day and for days together continuously, the crypto analyzers may crack the code or find out the encryption method and may intrude or spy or hack the confidential data. This necessitates a robust encryption technique. This work highlights one of the novel approaches of an implementation of a highly secured cryptic algorithm which makes impossible for data theft. Many researchers have been made with the multiple algorithms. This book presents a highly secured randomized encryption/decryption technique. Implementation presented in this book chooses a randomly switching model which combines the two or more crypto algorithms to work together as a single unit and there is switching among the algorithms at random times. This model being implemented on FPGA provides excellent area results.