Question: The DES is a _ _ _ _ _ _ _ _ _ , meaning a cryptographic key and algorithm are applied to a block

The DES is a _________, meaning a cryptographic key and algorithm are applied to a block of data simultaneously rather than one _____ at a time. To encrypt a ________ message, DES groups it into 64-bit blocks. Each block is enciphered using the secret key into a 64-bit _________ by means of permutation and substitution.

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