DES is the Data Encryption Standard (Data Encryption Standard) abbreviation. It is developed by IBM as a encryption algorithm, the United States National Bureau of Standards published in 1977 as the use of non-confidential data encryption standards it is a sub-encryption algorithm, he has 64 for the packet of data encryption. At the same time, DES is a symmetric algorithm: encryption and decryption using the same algorithm. Its key length is 56 (since each section 8 are used for parity), keys can be arbitrary number of 56, but can also change any time.

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