Online DES Data Encryption

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    The Data Encryption Standard is a symmetric-key algorithm for the encryption of digital data. DES is an implementation of a Feistel Cipher. It uses 16 round Feistel structure. The block size is 64-bit. Though, key length is 64-bit, DES has key length of 56 bits, since 8 of the 64 bits of the key are not used by the encryption algorithm (function as check bits only).
    It has been found vulnerable to very powerful attacks and therefore, the popularity of DES has been found slightly on the decline.