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Cryptography techniques need some algorithms for encryption of data. Many of availableencryption techniques are used for textual data, a few of encryption methods are used formultimedia data; however, this algorithms that are used for textual data may be inefficient formultimedia. The most popular symmetric key algorithms are Data Encryption Standard(DES). However, DES may not be suitable for multimedia because it consumes times.Encryption and decryption of these data require different methods. This paper proposes anencryption and decryption of data by using the nature of Fractional Fourier Transform (FrFT)in signals analysis, based on multi-order FrFT. A different indicators to evaluate the securityof an encryption technique have been discussed. These indicators are: sensitivity proposedtechniques for the key, the complexity of the processes, and statistical analysis. The key isformed by combination of order of FrFT. The encrypted data is obtained by the summation ofdifferent orders. Numerical simulation results are given to demonstrate this proposed method.

COMPARITIVE STUDY BTEWEEN DES ALGORITHM, AND FRFT FOR DATA ENCRYPTION USING FPGA