DES algorithm for the key system of symmetrical cipher system, also known as the United States of America data encryption standard, is a 1972 American IBM company developed the symmetric encryption algorithm. Express according to the64group, the key length of 64bits, the key is in fact56 to participate in DES operation ( eighth,16,24,32,40,48,56,64is the check digit, so that each key has an odd number of1) after grouping expressly group and a 56 bit key according to a replacement or exchange method of forming ciphertext encryption method.

DES.docx

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