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An approach to encrypt and decrypt the text files using FFT and IFFT algorithm respectively. Cryptography involves encryption and decryption process. The use of data encryption is to provide security to the confidential data from unauthorized access. Decryption is the conversion of encrypted data into original information. The design is implemented in Lab VIEW software. The basic operations include conversion of characters from text file into encrypted data in encryption module. The retrieval of original information is done at the decryption module.