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Portable Network Graphic | 1993-05-04 | 87KB | 816x1056 | 8-bit (256 colors)

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OCR: Copyright Paul D Bain, 1993 Private -key cryptog 'aphy became available in computers with the Data Encryption Standard (DES) 58 DES was originally developed at IBM and was defined and endorsed by the U.S. government i 197759 DES can encrypt information for both communications and storage. 60 DES encrypts information with 54- -bit key operating on 64-bit blocks. As the number of bits in the secret key increases, the number of coding sequences increases Therefore the DES 54-bit key offers more protection than could 32-bit key. DES is best used with triple encryption and proper key management: Triple encryption involves successively encrypting each file of information under three different DES keys. Triple encryption effectively doubles the size of the 52-bit key preventing unauthorized decry ...